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Statistical Probability MCQ

Statistical Probability MCQ

 

1. The classical approach to probability requires that the outcomes are _______.

Answer

Correct Answer: Equally likely

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2. In a probability histogram, there is a correspondence between _______.

Answer

Correct Answer: Random Variable

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3. This is an arrangement of data, usually in rows and columns. it is called a ___.

Answer

Correct Answer: Trend

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4. Selections made with replacement are considered to be _______.

Answer

Correct Answer: Independent

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5. As the margin of error decreases, the width of the confidence interval _______________.

Answer

Correct Answer: Decreases

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6. As the degrees of freedom increase, the t distribution approaches the _____ distribution.

Answer

Correct Answer: Normal

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7. An individual at the 50th percentile would have a z score of ______.

Answer

Correct Answer: Zero

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8. The quality of a normal curve that is relatively ____ compared with a normal distribution.

Answer

Correct Answer: Peaked

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9. The quality of a normal curve that is relatively ____ compared with a normal distribution.

Answer

Correct Answer: Flat

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10. The quality of a distribution that defines how flat or peaked it is called

Answer

Correct Answer: Kurtosis

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11. The quality of a distribution that defines the disproportionate frequency of certain scores is called

Answer

Correct Answer: Skewness

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12. Z score is standard scores

Answer

Correct Answer: True

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13. A raw score that is adjusted for the mean and standard deviation of the distribution from which the raw score comes is called

Answer

Correct Answer: Z score

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14. The quality of the normal curve such that the tails never touch the horizontal axis is called

Answer

Correct Answer: Asymptotic

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15. A distribution of ____ that is symmetrical about the mean, the median, and the mode and has asymptotic tails is bell shaped curve.

Answer

Correct Answer: Scores

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16. Which type of shaped curve is normal curve?

Answer

Correct Answer: Bell shaped

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17. Faculty in the psychology department at State University consume an average of 5 cups of coffee per day with a standard deviation of 1.5. The distribution is normal. What proportion of faculty consumes an amount between 4 and 6 cups?

Answer

Correct Answer: 0.4972

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18. What percentage of scores falls within three standard deviation of the mean?

Answer

Correct Answer: 99.5%

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19. If the shape of a frequency distribution is lopsided, with a long tail projecting longer to the right than to the left, how would the distribution be skewed?

Answer

Correct Answer: Positively

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20. Faculty in the psychology department at State University consumes an average of 5 cups of coffee per day with a standard deviation of 1.5. The distribution is normal. What is the percentile rank for an individual who consumed 8 cups of coffee per day?

Answer

Correct Answer: 97.72

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21. When a z-score is NOT in the region of rejection, we should ______.

Answer

Correct Answer: Not reject the idea that the sample represents the raw score population

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22. When a z-score is NOT in the region of rejection, we should ______.

Answer

Correct Answer: Not reject the idea that the sample represents the raw score population

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23. A z score is a standard score with a:

Answer

Correct Answer: M = 0 and SD = 1

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24. If the shape of a frequency distribution is lopsided, with a long tail projecting longer to the left than to the right, how would the distribution be skewed?

Answer

Correct Answer: Negatively

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25. If the probability of getting a z-score between the mean of +1 standard deviation is 0.3413, what is the probability of getting a z-score of +1 standard deviation or less?

Answer

Correct Answer: 0.8413

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26. If Joe scored 25 on a test with a mean of 20 and a standard deviation of 5, what is his z-score?

Answer

Correct Answer: +1.0

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27. “Asymptotic” refers to the following:

Answer

Correct Answer: Tails of the normal curve

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28. In a negatively skewed distribution, the mean is ______ the median and ______ mode.

Answer

Correct Answer: Less than; less than

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29. A z-score is most affected by the ______.

Answer

Correct Answer: Standard deviation

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30. In a negatively skewed distribution, the mode is ______ the median and ______ mean.

Answer

Correct Answer: Greater than; greater than

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31. Sue took a test in both biology and math last week. The biology test had a mean of 70 and a standard deviation of 7, whereas the math test had a mean of 75 and a standard deviation of 10. Sue scored a 76 on the biology test and a 76 on the math test. On which test did she do better in comparison to the rest of the class?

Answer

Correct Answer: The biology test

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