1. Chapter 18-20 Review Problems
AP Statistics
Chapter Review Problems

2. The critical value for a 99% confidence interval is:
1.645
1.96
2.326
2.576
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3. Which of the following will reduce the width of a confidence interval?
Increase the sample size
Increase the confidence level
Decrease the sample size
Increase the sample proportion by 0.5
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4. Which of the following is the correct interpretation of a 95% confidence interval?
There is a 95% chance that the sample statistic is contained in the confidence interval.
95% of the confidence intervals constructed around a sample statistic will contain the population parameter.
There is a 95% chance that the population parameter lies in the confidence interval.
The terms of confidence and probability are interchangeable.
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5. If the sample size were to increase, the width of a confidence interval would decrease
True
False

6. An increase in confidence level generally results in an increase in the width of the confidence interval.
True
False

7. Suppose the p-value of a test is .046. We can conclude:
At α = .03, reject Ho.
At α = .04, reject Ho.
At α = .02, fail to reject Ho.
At α = .05, fail to reject Ho.
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8. A confidence interval can be created after a census has been conducted.
True
False

9. If one would like a smaller confidence interval, one could decrease sample size or increase the confidence level.
True
False

10. The sample size should be increased to decrease the margin of error.
If the p-value of a test is less than the level of significance (α), then which of the following is a correct conclusion?
The sample size should be increased to decrease the margin of error.
The null hypothesis is true.
The corresponding confidence interval will contain the hypothesized value of the parameter in the null hypothesis.
The value of the test statistic is in the rejection region for this test.
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11. An upper one-tailed hypothesis test for a proportion was conducted using the α = .01. There was significant evidence for the Ha. Which of the following is a possible value for the test statistic?
2.356
2.315
1.986
Both A and B
A, B, and C
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