1. The classical approach to probability requires that the outcomes are _______.
Answer
Correct Answer:
Equally likely.
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2. It is estimated that over ___________% of all crashes in the u.s. are caused by driver distraction.
Answer
Correct Answer:
75
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3. It has been reported that the use of credit cards increases the ________ of customer spending.
Answer
Correct Answer:
Probability
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4. Selections made with replacement are considered to be _______.
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Correct Answer:
Independent
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5. Tropical rainforests are not located in _______.
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Correct Answer:
England
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6. The ________ of a random variable corresponds to the notion of the mean, or average, for a sample.
Answer
Correct Answer:
Expected value
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7. Smoking and the episodes of lung cancer have a high correlation, but it does not prove ________.
Answer
Correct Answer:
Causation
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8. Who, what, when, where, and why are elements of _____.
Answer
Correct Answer:
Historic events
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9. If n1 = n2 and n is relatively large, then the t test is relatively robust against ____.
Answer
Correct Answer:
Violations of the assumptions of homogeneity of variance and normality
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10. If its assumptions are met, the analysis of variance technique is appropriate when ____.
Answer
Correct Answer:
All of the other three options
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11. As the separation between the two groups of scores increases, uobt ____.
Answer
Correct Answer:
Increases
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12. A disadvantage of using an arithmetic mean to summarize a set of data is that __________.
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Correct Answer:
It can be biased by one or two extremely small or large values
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13. If the order of the items selected matters, then we have a _______.
Answer
Correct Answer:
Permutation Problem
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14. When conducting a survey, it is important to choose a sample that __________.
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Correct Answer:
To avoid bias and to get a representative sample
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15. Typically, a focus group should include ________ customers.
Answer
Correct Answer:
8-10
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16. The population of the united states has grown approximately _____ times since 1790.
Answer
Correct Answer:
100
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17. The size of the box in a boxplot shows the ____________________ of the data set.
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Correct Answer:
Interquartile range
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18. Nielsen in its credited with providing _______________________ services.
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Correct Answer:
Lifestyle
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19. Maximal oxygen uptake is the best single measurement of __________________.
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Correct Answer:
Endurance
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20. For small samples, t intervals are ___________ z intervals based on the same data set.
Answer
Correct Answer:
Wider than
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21. A(n) ___________ solution satisfies all the constraint expressions simultaneously.
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Correct Answer:
Feasible
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22. Math.pow(3, 3) returns ________.
Answer
Correct Answer:
27
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23. The form of the continuous uniform probability distribution is _____.
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Correct Answer:
Rectangular
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24. When using two predictor variables, these variables should be ____________.
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Correct Answer:
Independent
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25. _____ involves reentering data that was not typed or scanned correctly.
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Correct Answer:
Data correctly
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26. The least squares criterion is _____.
Answer
Correct Answer:
Min Σ(yi - ŷi)2
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27. In a probability histogram, there is a correspondence between _______.
Answer
Correct Answer:
Area and probability
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28. Class width is found by _______.
Answer
Correct Answer:
Subtracting a lower class limit from the next consecutive lower class limit
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29. An example of a qualitative variable is _________________.
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Correct Answer:
Color of ink in a pen
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30. The empirical rule applies to distributions that are ________.
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Correct Answer:
Both
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31. Checklists with several items to be considered by respondents may be subject to _____.
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Correct Answer:
Recency effects
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32. In order to summarize qualitative data, a useful tool is a __________.
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Correct Answer:
Frequency distribution
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33. In a multiple rating list scale, ____.
Answer
Correct Answer:
It is possible to visualize the results better than with other numerical scales
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34. The area under the normal curve to the right of mu equals _______.
Answer
Correct Answer:
0
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35. Sample size and the confidence level width have a (n) __________ relationship.
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Correct Answer:
Inverse
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36. As the degrees of freedom increase, the t distribution approaches the _____ distribution.
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Correct Answer:
Normal
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37. A critical value, z subscript alpha, denotes the _______.
Answer
Correct Answer:
Z-score with an area of alpha to its right.
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38. ________ is a single value used to describe the center point of a data set.
Answer
Correct Answer:
Central Tendency
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39. The distribution of sample means ____.
Answer
Correct Answer:
Will be normal if either the population is normal or the sample size is n>30
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40. The standard error of estimate can be used for constructing a(n) __________ interval about a value.
Answer
Correct Answer:
Prediction
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41. In point estimation, data from the _____.
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Correct Answer:
Sample are used to estimate the population parameter
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42. A contingency table would be used to summarize data such as ________.
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Correct Answer:
Company employees by gender and organizational title
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43. A scatter diagram is a(n) __________ step in exploring a relationship between two variables.
Answer
Correct Answer:
Preliminary
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44. The t- distribution for developing a confidence interval for a mean has _____ degrees of freedom.
Answer
Correct Answer:
N - 1
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45. A skewed distribution typically has _____ tail(s) and a normal distribution has ____ tail(s).
Answer
Correct Answer:
1,2
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46. The ________ measures the total variation in the dependent variable in simple regression analysis.
Answer
Correct Answer:
Sum of squares regression
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47. The ________ measures a distribution's standard deviation in terms of its percentage to the mean.
Answer
Correct Answer:
Coefficient of variation
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48. The test statistics for one-way anova follows the _______.
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Correct Answer:
F-distribution
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49. The probability that a normal random variable is less than its mean is _______.
Answer
Correct Answer:
0.5.
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50. The parameter p represents the ________ of successes in the population.
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Correct Answer:
Proportion
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51. Children ages 2-5 watch an average of ____ hours of television a week.
Answer
Correct Answer:
28
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52. A(n) __________ is an unusually small or unusually large data value.
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Correct Answer:
Outlier
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53. In a scatter diagram, we describe the relationship between __________.
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Correct Answer:
Two variables measured at the interval or ratio level
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54. In performing a one-way anova, the _________ is the between-group variance.
Answer
Correct Answer:
MS Error
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55. The _____ distribution is used for testing the significance of the slope term.
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Correct Answer:
T
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56. Proportion is ________________
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Correct Answer:
The relative size of an object as compared to another, or as compared to the other elements in the piece.
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57. If a and b are mutually exclusive events with p(a) = 0.2 and p(b) = 0.6, then p(a or b) = _____.
Answer
Correct Answer:
0.8
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58. A useful estimator for the population mean is the _______.
Answer
Correct Answer:
Sample Mean
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59. The computation of fe ____.
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Correct Answer:
Is based on known population proportions
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60. A ____________ variable can have values that are numbers on the real number line.
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Correct Answer:
Quantitative
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61. When using the _______ always be careful to avoid double-counting outcomes.
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Correct Answer:
Addition rule
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62. The _____________ is the best point estimate of the population mean.
Answer
Correct Answer:
Sample mean
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63. The _______ of a discrete random variable represents the mean value of the outcomes.
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Correct Answer:
Expected value
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64. The five number summary can be calculated ___________.
Answer
Correct Answer:
Both A & B
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65. If the chosen significance level is ? = 0.05, then ____________________________________________.
Answer
Correct Answer:
There is a 5% probability of rejecting a true null hypothesis
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66. Behavior is to mental processes as ________ is to ________.
Answer
Correct Answer:
Talking; understanding
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67. Automobile exhaust emission of co2 (milligrams per mile) is ____________ data.
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Correct Answer:
Ratio Data
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68. A firm's ________ is defined as its theory about how to gain competitive advantages.
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Correct Answer:
Strategy
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69. A dot plot shows ____________.
Answer
Correct Answer:
The general shape of a distribution.
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70. As the margin of error decreases, the width of the confidence interval _______________.
Answer
Correct Answer:
Decrease
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71. For a fixed sample size, the lower we set α, the higher is the ___________.
Answer
Correct Answer:
Type II error
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72. All of the following are measures of central tendency except the ____________.
Answer
Correct Answer:
Range
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73. A ranking scale is a scale that _____.
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Correct Answer:
Scores an object without making a direct comparison to another object
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74. A correlation analysis requires that the data be either ________ data or _______ data.
Answer
Correct Answer:
Interval, ratio
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75. The complement of an event a, within the sample space s, is the event consisting of ____________.
Answer
Correct Answer:
All outcomes in S that are not in A
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76. When a class interval is expressed as 100 up to 200, _________________________.
Answer
Correct Answer:
Observations with values of 200 are excluded from the class frequency
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77. The ____________ hypothesis is not rejected unless there is sufficient sample evidence to do so.
Answer
Correct Answer:
Null
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78. Excel's __________ can be used to construct a frequency distribution for categorical data.
Answer
Correct Answer:
COUNTIF function
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79. In the t test for independent samples, the actual statistical test is__________________.
Answer
Correct Answer:
Nondirectional
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80. When using student's t to compute an interval estimate, ___________.
Answer
Correct Answer:
We assume that the samples are collected from normally distributed populations and estimate the population standard deviation based on the sample standard deviation
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81. A histogram aids in analyzing the _______ of the data.
Answer
Correct Answer:
Shape of the distribution
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82. The total degrees of freedom for an experiment with n1 = 10, n2 = 12, and n3 = 10 is ____.
Answer
Correct Answer:
33
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83. When a correlation exists, lowering the range of either of the variables will _________.
Answer
Correct Answer:
Lower the correlation
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84. The variance is equal to the _____.
Answer
Correct Answer:
Squared value of the standard deviation
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85. The word and in probability implies that we use the ________ rule.
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Correct Answer:
Multiplication
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86. The true sampling error is usually not known because ________.
Answer
Correct Answer:
µ is unknown
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87. The size of the sampling error is ________.
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Correct Answer:
Inversely related to the sample size—in other words, the larger the sample size, the smaller the sampling error
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88. The critical value for a hypothesis test _______.
Answer
Correct Answer:
The significance level and determines the boundary for the rejection region
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89. Methods used that summarize or describe characteristics of data are called _______ statistics.
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Correct Answer:
Descriptive
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90. ________ probability represents the likelihood of a single event occurring by itself.
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Correct Answer:
Simple
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91. A _____ is a variable that changes the nature of the relationship between two other variables.
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Correct Answer:
Independent variable
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92. ________ is defined as recorded facts or figures.
Answer
Correct Answer:
Data
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93. ______ are the graphical components of regression analysis.
Answer
Correct Answer:
Scatter diagrams
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94. The t test for independent means is used when each group is tested ____________.
Answer
Correct Answer:
Only once
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95. The t test for correlated groups requires that ____.
Answer
Correct Answer:
The sampling distribution of variance is normally distributed
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96. The t distribution approaches the _______________ distribution as the sample size ___________.
Answer
Correct Answer:
Z, increases
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97. The sum of the differences between sample observations and the sample mean is equal to _______.
Answer
Correct Answer:
Zero
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98. The sampling distribution of chi-square is ____.
Answer
Correct Answer:
All of the other three options
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99. The sample mean is _____ the confidence interval.
Answer
Correct Answer:
In the center of
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100. The range rule of thumb roughly estimates the standard deviation of a data set as _______.
Answer
Correct Answer:
S= RANGE/4
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101. The proportion of scores less than z = 0.00 is _________.
Answer
Correct Answer:
0.50
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102. The probability distribution of all possible values of the sample mean is called the ____.
Answer
Correct Answer:
Sampling distribution of the sample mean
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103. The points at xequals=_______ and xequals=_______ are the inflection points on the normal curve.
Answer
Correct Answer:
The points are x= μ− σ and x = μ+ σ
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104. Probabilities are important information when __________.
Answer
Correct Answer:
Applying descriptive statistics
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105. Parameters are associated with __________; whereas, statistics are associated with __________.
Answer
Correct Answer:
Populations; samples
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106. Mean absolute deviation, standard deviation, and variance are all measures of the __________.
Answer
Correct Answer:
Variability of a data set
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107. In the t test for independent groups, ____.
Answer
Correct Answer:
We estimate
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108. In order to test a nondirectional hypothesis, a researcher would use a __________ test.
Answer
Correct Answer:
Critical
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109. In a contingency table, we describe the relationship between ________.
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Correct Answer:
Two variables measured at the nomical or ordinal level
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110. If you are asked to find the 85th percentile, you are being asked to find _____.
Answer
Correct Answer:
A data value associated with an area of 0.85 to its right
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111. If x is a binomial random variable with n=10 and p=0.8, the mean value of x is _____.
Answer
Correct Answer:
8
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112. If two events are independent, then their joint probability is computed with _________.
Answer
Correct Answer:
The special rule of multiplication
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113. If n1 = 6, n2 = 8 and a = 0.052 tail, ucrit value is ____.
Answer
Correct Answer:
8
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114. If n = 18 and a = 0.052 tailed, the value of tcrit is ____.
Answer
Correct Answer:
39
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115. If a binomial distribution has p = .30, then q = ____.
Answer
Correct Answer:
0.70
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116. If a = 0.05, and df = 4, the value of c 2crit = ____.
Answer
Correct Answer:
9.488
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117. For the repeated-measures t statistic, df = _____.
Answer
Correct Answer:
N1 + n2
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118. For a data set, half of the observations are always greater than the _______.
Answer
Correct Answer:
Median
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