AP Statistics Name __________________________________________________________
Chapter 10 Review Part I - Multiple Choice (Questions 1-10) - Circle the answer of your choice.
1. If the 90% confidence interval of the mean of a population is given by
45 3.24
, which of the following is correct?
(a) There is a 90% probability that the true mean is in the interval.
(b) There is a 90% probability that the sample mean is in the interval.
(c) If 1,000 samples of the same size are taken from the population, then approximately 900 of them will contain the true mean.
(d) There is a 90% probability that a data value, chosen at random, will fall in the interval.
(e) None of the above.
2. Which of the following will reduce the width of a confidence interval?
I. Increasing the confidence level.
II. Increasing the sample size.
III. Decreasing the standard deviation.
(a) I only
(b) I and II only.
(c) II and III only.
(d) I, II, and III.
(e) None of the above.
3. Which of the following is true?
(a) A highly significant result indicates that the sample result never really happened.
(b) If the probability of sample data yielding a statistic as or more extreme than a given value is approximately 0, then we have a good
indication that bias must have been involved with the data collection.
(c) If the probability of sample data yielding a statistic as or more extreme than a given value is approximately 0, then we have a good
indication that the value of the parameter could be significantly different than what is stated.
(d) If the probability of sample data yielding a statistic as or more extreme than a given value is approximately 0, then we have a good
indication that whoever stated the expected value is lying.
(e) None of the above.
4. The P-value of a test of significance is the probability that:
(a) The decision resulting from the test is correct.
(b) 95% of the confidence intervals will contain the parameter of interest.
(c) The null hypothesis is true.
(d) The alternative hypothesis is true.
(e) None of the above.
5. The confidence that we feel about a 90% confidence interval comes from the fact that
(a) there is a 90% chance that the population parameter is contained in the confidence interval.
(b) there is a 90% chance that the sample statistic is contained in the confidence interval
(c) 90% of the confidence intervals constructed around a sample statistic will contain the population parameter
(d) the terms confidence and probability are interchangeable
(e) the concepts of confidence and probability are synonymous
