9. Hypothesis Testing for One Sample

Claim of “At Least” or “At Most”

How do the following results change?

a. Chapter Problem claim is changed to this: “At least 50% of Internet users utilize two-factor authentication to protect their online data.”

Test Statistics

In Exercises 9–12, refer to the exercise identified and find the value of the test statistic. (Refer to Table 8-2 to select the correct expression for evaluating the test statistic.)

Exercise 5 “Landline Phones”

In hypothesis testing, which two types of hypotheses are formulated, and how are they related to each other?

Which of the following is not a conclusion of the central limit theorem?

Which of the following is not a true statement about error in hypothesis testing?

Which of the following is typically the first step when conducting a significance test in practice?

Which of the following is not true when testing a claim about a population proportion?

Which of the following is not a true statement about error in hypothesis testing?

Which of the following is not a characteristic of the $t$ test?

Which of the following is not a conclusion of the central limit theorem?

The National Bureau of Economic Research (NBER) is a private, nonprofit, nonpartisan research organization. The NBER provides information for better understanding of how the U.S. economy works. Researchers at the NBER concentrate on four types of empirical research: developing new statistical measurements, estimating quantitative models of economic behavior, assessing the effects of public policies on the U.S. economy, and projecting the effects of alternative policy proposals.One of the NBER’s interests is the median income of people in different regions of the United States. The table at the right shows the annual incomes (in dollars) of a random sample of people (15 years and over) in a recent year in four U.S. regions: Northeast, Midwest, South, and West.

In Exercises 1–5, refer to the annual incomes of people in the table. Use for all tests.

Use technology to perform a sign test to test the claim that the median annual income in the Midwest is greater than \$30,000.

Which of the following is not a criterion for making a decision in a hypothesis test?

Which of the following is the correct sequence of steps in hypothesis testing for determining if two population means are similar?

Which of the following graphs best represents the rejection region for the hypothesis test with null hypothesis $H_0:p\le 8.1$?

Which of the following best describes the null hypothesis for an independent-samples t-test?