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Chapter 11: Q. 49 (page 657)
State the decision and conclusion (in a complete sentence) for the following preconceived levels of \(\alpha\).
\(df=\)___
The degree of freedom \(df\) is \(4\).
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The Bureau of Labor Statistics gathers data about employment in the United States. A sample is taken to calculate the number of U.S. citizens working in one of several industry sectors over time. Table 11.17 shows the results:
We want to know if the change in the number of jobs is independent of the change in years. State the null and alternative hypotheses and the degrees of freedom .
What is the test statistic?
According to an avid aquarist, the average number of fish in a -gallon tank is , with a standard deviation of two. His friend, also an aquarist, does not believe that the standard deviation is two. She counts the number of fish in other -gallon tanks. Based on the results that follow, do you think that the standard deviation is different from two? Data:
The owner of a baseball team is interested in the relationship between player salaries and team winning percentage. He takes a random sample of players from different organizations.
A sample standard deviation of minutes is the same as a sample variance of __________ minutes.
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