The classical approach to probability requires that the outcomes are _______.
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Correct Answer:
Equally likely.
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It is estimated that over ___________% of all crashes in the u.s. are caused by driver distraction.
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Correct Answer:
75
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It has been reported that the use of credit cards increases the ________ of customer spending.
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Probability
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Selections made with replacement are considered to be _______.
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Independent
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Tropical rainforests are not located in _______.
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England
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The ________ of a random variable corresponds to the notion of the mean, or average, for a sample.
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Expected value
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Smoking and the episodes of lung cancer have a high correlation, but it does not prove ________.
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Correct Answer:
Causation
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Who, what, when, where, and why are elements of _____.
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Historic events
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If n1 = n2 and n is relatively large, then the t test is relatively robust against ____.
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Violations of the assumptions of homogeneity of variance and normality
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If its assumptions are met, the analysis of variance technique is appropriate when ____.
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All of the other three options
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As the separation between the two groups of scores increases, uobt ____.
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Increases
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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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If the order of the items selected matters, then we have a _______.
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Permutation Problem
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When conducting a survey, it is important to choose a sample that __________.
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To avoid bias and to get a representative sample
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Typically, a focus group should include ________ customers.
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8-10
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The population of the united states has grown approximately _____ times since 1790.
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100
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The size of the box in a boxplot shows the ____________________ of the data set.
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Interquartile range
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Nielsen in its credited with providing _______________________ services.
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Lifestyle
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Maximal oxygen uptake is the best single measurement of __________________.
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Endurance
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For small samples, t intervals are ___________ z intervals based on the same data set.
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Correct Answer:
Wider than
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A(n) ___________ solution satisfies all the constraint expressions simultaneously.
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Feasible
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Math.pow(3, 3) returns ________.
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Correct Answer:
27
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The form of the continuous uniform probability distribution is _____.
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Rectangular
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When using two predictor variables, these variables should be ____________.
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Independent
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_____ involves reentering data that was not typed or scanned correctly.
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Data correctly
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The least squares criterion is _____.
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Correct Answer:
Min Σ(yi - ŷi)2
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In a probability histogram, there is a correspondence between _______.
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Area and probability
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Class width is found by _______.
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Subtracting a lower class limit from the next consecutive lower class limit
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An example of a qualitative variable is _________________.
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Color of ink in a pen
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The empirical rule applies to distributions that are ________.
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Correct Answer:
Both
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Checklists with several items to be considered by respondents may be subject to _____.
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Recency effects
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In order to summarize qualitative data, a useful tool is a __________.
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Frequency distribution
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In a multiple rating list scale, ____.
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It is possible to visualize the results better than with other numerical scales
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The area under the normal curve to the right of mu equals _______.
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0
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Sample size and the confidence level width have a (n) __________ relationship.
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Inverse
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As the degrees of freedom increase, the t distribution approaches the _____ distribution.
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Normal
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A critical value, z subscript alpha, denotes the _______.
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Z-score with an area of alpha to its right.
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________ is a single value used to describe the center point of a data set.
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Central Tendency
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The distribution of sample means ____.
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Will be normal if either the population is normal or the sample size is n>30
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The standard error of estimate can be used for constructing a(n) __________ interval about a value.
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Prediction
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In point estimation, data from the _____.
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Sample are used to estimate the population parameter
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A contingency table would be used to summarize data such as ________.
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Company employees by gender and organizational title
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A scatter diagram is a(n) __________ step in exploring a relationship between two variables.
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Correct Answer:
Preliminary
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The t- distribution for developing a confidence interval for a mean has _____ degrees of freedom.
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Correct Answer:
N - 1
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A skewed distribution typically has _____ tail(s) and a normal distribution has ____ tail(s).
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Correct Answer:
1,2
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The ________ measures the total variation in the dependent variable in simple regression analysis.
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Correct Answer:
Sum of squares regression
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The ________ measures a distribution's standard deviation in terms of its percentage to the mean.
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Coefficient of variation
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The test statistics for one-way anova follows the _______.
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F-distribution
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The probability that a normal random variable is less than its mean is _______.
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0.5.
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The parameter p represents the ________ of successes in the population.
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Proportion
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Children ages 2-5 watch an average of ____ hours of television a week.
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Correct Answer:
28
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A(n) __________ is an unusually small or unusually large data value.
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Outlier
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In a scatter diagram, we describe the relationship between __________.
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Two variables measured at the interval or ratio level
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In performing a one-way anova, the _________ is the between-group variance.
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MS Error
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The _____ distribution is used for testing the significance of the slope term.
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T
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Proportion is ________________
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The relative size of an object as compared to another, or as compared to the other elements in the piece.
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If a and b are mutually exclusive events with p(a) = 0.2 and p(b) = 0.6, then p(a or b) = _____.
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Correct Answer:
0.8
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A useful estimator for the population mean is the _______.
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Correct Answer:
Sample Mean
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The computation of fe ____.
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Is based on known population proportions
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A ____________ variable can have values that are numbers on the real number line.
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Quantitative
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When using the _______ always be careful to avoid double-counting outcomes.
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Addition rule
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The _____________ is the best point estimate of the population mean.
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Sample mean
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The _______ of a discrete random variable represents the mean value of the outcomes.
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Expected value
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The five number summary can be calculated ___________.
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Correct Answer:
Both A & B
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If the chosen significance level is ? = 0.05, then ____________________________________________.
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Correct Answer:
There is a 5% probability of rejecting a true null hypothesis
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Behavior is to mental processes as ________ is to ________.
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Talking; understanding
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Automobile exhaust emission of co2 (milligrams per mile) is ____________ data.
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Ratio Data
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A firm's ________ is defined as its theory about how to gain competitive advantages.
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Strategy
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A dot plot shows ____________.
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The general shape of a distribution.
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As the margin of error decreases, the width of the confidence interval _______________.
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Decrease
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For a fixed sample size, the lower we set α, the higher is the ___________.
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Type II error
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All of the following are measures of central tendency except the ____________.
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Range
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A ranking scale is a scale that _____.
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Scores an object without making a direct comparison to another object
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A correlation analysis requires that the data be either ________ data or _______ data.
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Correct Answer:
Interval, ratio
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The complement of an event a, within the sample space s, is the event consisting of ____________.
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Correct Answer:
All outcomes in S that are not in A
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When a class interval is expressed as 100 up to 200, _________________________.
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Correct Answer:
Observations with values of 200 are excluded from the class frequency
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The ____________ hypothesis is not rejected unless there is sufficient sample evidence to do so.
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Null
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Excel's __________ can be used to construct a frequency distribution for categorical data.
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Correct Answer:
COUNTIF function
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In the t test for independent samples, the actual statistical test is__________________.
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Correct Answer:
Nondirectional
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When using student's t to compute an interval estimate, ___________.
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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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A histogram aids in analyzing the _______ of the data.
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Correct Answer:
Shape of the distribution
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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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When a correlation exists, lowering the range of either of the variables will _________.
Answer
Correct Answer:
Lower the correlation
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The variance is equal to the _____.
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Correct Answer:
Squared value of the standard deviation
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The word and in probability implies that we use the ________ rule.
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Multiplication
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The true sampling error is usually not known because ________.
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µ is unknown
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The size of the sampling error is ________.
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Inversely related to the sample size—in other words, the larger the sample size, the smaller the sampling error
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The critical value for a hypothesis test _______.
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The significance level and determines the boundary for the rejection region
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Methods used that summarize or describe characteristics of data are called _______ statistics.
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Descriptive
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________ probability represents the likelihood of a single event occurring by itself.
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Simple
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A _____ is a variable that changes the nature of the relationship between two other variables.
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Independent variable
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________ is defined as recorded facts or figures.
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Data
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______ are the graphical components of regression analysis.
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Correct Answer:
Scatter diagrams
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The t test for independent means is used when each group is tested ____________.
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Correct Answer:
Only once
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The t test for correlated groups requires that ____.
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Correct Answer:
The sampling distribution of variance is normally distributed
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The t distribution approaches the _______________ distribution as the sample size ___________.
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Correct Answer:
Z, increases
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The sum of the differences between sample observations and the sample mean is equal to _______.
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Zero
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The sampling distribution of chi-square is ____.
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Correct Answer:
All of the other three options
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The sample mean is _____ the confidence interval.
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Correct Answer:
In the center of
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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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