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Statistics MCQs for Practice

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1. Some normal probability distributions may have the same mean, but their standard deviation may be different
True or False

2. As the sample size increases, the standard error of the sample mean increases.
True or False

3. Which of the following statement(s) about the normal probability distribution is/are true?
a. The mean equals the mode and the median
b. The median equals the mode
c. The mean divides the distribution into two equal parts.
d. All of the above
e. None of the above

4. The mean of a normal probability distribution is 400 and the standard deviation is 10. Approximately 95% of the values of the distribution lie between what two values?
a. 375 and 425
b. 300 and 500
c. 390 and 410
d. 275 and 525
e. 380 and 420

5. What must you know to develop a binomial probability distribution?
a. The probability of a success
b. The number of trials
c. The number of successes
d. The probability of a success and the number of trials.
e. The number of trials and the number of successes

6. The automobile club performed a survey and discovered that 80% of diarvers in Delaware wear seatbelts. A sample of 10 drivers was selected. What is the probability that at least 5 wore seatbelts?
a. Binomial
b. Continuous distribution
c. Cannot tell from the information given.
d. None of the above

7. A survey of college statistics professors showed an average salary of \$42,000.00 per year with a standard deviation of \$6,000.00. What percent of statistics professors earn between \$36,000.00 and \$48,000.00?
a. Binomial
b. Continuous distribution
c. Cannot tell form the information given.