AP STATISTICS UNIT 5 PROGRESS CHECK
MCQ PART C PRACTICE SET 2026
QUESTIONS AND ANSWERS HIGH SCORE
GUIDE
●● At a manufacturing company, the percent of defective items
produced on the assembly line is 2%. The company is testing a new
assembly line designed to reduce the percent of defective parts. The null
and alternative hypotheses of the test are described as follows.
H0 : The percent of defective parts is at least 2%.
Ha : The percent of defective parts is less than 2%.
Which of the following describes a Type II error that could result from
the test?.
Answer: C. The test does not provide convincing evidence that the
percent is less than 2%, but the actual percent is 1%.
●● Which of the following is defined by the significance level of a
hypothesis test?.
Answer: D. The probability of Type I error
, ●● Consider a hypothesis test in which the significance level is α = 0.05
and the probability of a Type II error is 0.18. What is the power of the
test?.
Answer: B. 0.82
●● If all other factors are held constant, which of the following results in
an increase in the probability of a Type II error?.
Answer: C. The significance level is decreased.
●● If all other factors are held constant, which of the following results in
a decrease in the probability of a Type II error?.
Answer: D. The standard error is decreased.
●● A new drug to treat a certain condition is being tested. The null
hypothesis of the test is that the drug is not effective. For the researchers,
the more consequential error would be for the drug to be effective, but
the test does not detect the effect.
Which of the following should the researchers do to avoid the more
consequential error?.
Answer: A. Increase the significance level to increase the probability of
Type II error.
●● Researchers are testing a new diagnostic tool designed to identify a
certain condition. The null hypothesis of the significance test is that the
MCQ PART C PRACTICE SET 2026
QUESTIONS AND ANSWERS HIGH SCORE
GUIDE
●● At a manufacturing company, the percent of defective items
produced on the assembly line is 2%. The company is testing a new
assembly line designed to reduce the percent of defective parts. The null
and alternative hypotheses of the test are described as follows.
H0 : The percent of defective parts is at least 2%.
Ha : The percent of defective parts is less than 2%.
Which of the following describes a Type II error that could result from
the test?.
Answer: C. The test does not provide convincing evidence that the
percent is less than 2%, but the actual percent is 1%.
●● Which of the following is defined by the significance level of a
hypothesis test?.
Answer: D. The probability of Type I error
, ●● Consider a hypothesis test in which the significance level is α = 0.05
and the probability of a Type II error is 0.18. What is the power of the
test?.
Answer: B. 0.82
●● If all other factors are held constant, which of the following results in
an increase in the probability of a Type II error?.
Answer: C. The significance level is decreased.
●● If all other factors are held constant, which of the following results in
a decrease in the probability of a Type II error?.
Answer: D. The standard error is decreased.
●● A new drug to treat a certain condition is being tested. The null
hypothesis of the test is that the drug is not effective. For the researchers,
the more consequential error would be for the drug to be effective, but
the test does not detect the effect.
Which of the following should the researchers do to avoid the more
consequential error?.
Answer: A. Increase the significance level to increase the probability of
Type II error.
●● Researchers are testing a new diagnostic tool designed to identify a
certain condition. The null hypothesis of the significance test is that the
