Practice Quiz

DSST Principles of Statistics Exam Prep - Question List

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21.

People who score in the 95th percentile on an exam:

  1. Earned a score of 95 on the test
  2. Scored as well or better than 95% of the people who took the same exam
  3. Scored in the top 95% of test takers
  4. Answered 95% of the questions correctly
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22. What is the mean for the following distances? 206 miles, 410 miles, 97 miles, 125 miles, 999 miles, 234 miles
  1. 220 miles
  2. 407.88 miles
  3. 345.17 miles
  4. 206 miles
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23. To find the percentage (p) of any number (n), which formula can be used?
  1. (p x 100) ÷ n
  2. (p x n) ÷ 100
  3. 100 - (p x n)
  4. (n x 100) ÷ p
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24.

A significant limitation of regression analysis is:

  1. an incomplete understanding of the relationship between the independent and dependent variable
  2. an incomplete understanding of the relationship between the slope and the random error term
  3. an incomplete understanding of the relationship between the slope and the intercept
  4. an incomplete understanding of the relationship between the intercept and the random error term
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25.

A Sprint Telecom executive believes customers in a market segment are in their late 20s. He chooses and studies a sample of cell phone users with a mean age of 28 years when in fact, the population mean is 38 years. The probability of a Type II error increases as you:

  1. set the probability of the wrong population parameter higher
  2. set the probability of the wrong population parameter lower
  3. set the probability of a Type I error higher
  4. set the probability of a Type I error lower
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