Chapter 8: Q 4. (page 506)
Reporting cheating What proportion of students are willing to report cheating by other students? A student project put this question to an SRS of undergraduates at a large university: “You witness two students cheating on a quiz. Do you go to the professor?”
The proportion of students is
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The condition When constructing a confidence interval for a population proportion, we check that the sample size is less than of the population size.
a. Why is it necessary to check this condition?
b. What happens to the capture rate if this condition is violated?
More prayer in school Refer to Exercise . Interpret the confidence level.
Check them all Determine if the conditions are met for constructing a confidence interval for the population mean in each of the following settings.
a. We want to estimate the average age at which U.S. presidents have died. So we obtain a list of all U.S. presidents who have died and their ages at death.
b. Do teens text more than they call? To find out, an AP Statistics class at a large high school collected data on the number of text messages and calls sent or received by each of randomly selected students. The boxplot displays the difference (Texts − Calls) for each student.
In a poll conducted by phone,
I. Some people refused to answer questions.
II. People without telephones could not be in the sample.
III. Some people never answered the phone in several calls.
Which of these possible sources of bias is included in the margin of error announced for the poll?
a. I only
b. II only
c. III only
d. I, II, and III
e. None of these
Three branches According to a recent study by the Annenberg Foundation, only of adults in the United States could name all three branches of government. This was based on a survey given to a random sample ofU.S. adults.
a. Construct and interpret a confidence interval for the proportion of all U.S. adults who could name all three branches of government.
b. Does the interval from part (a) provide convincing evidence that less than half of all U.S. adults could name all three branches of government? Explain your answer.
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