Chapter 8: Problem 104
Suppose you wanted to test the claim that the majority of U.S. voters are satisfied with the government response to the opioid crisis. State the null and alternative hypotheses you would use in both words and symbols.
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Chapter 8: Problem 104
Suppose you wanted to test the claim that the majority of U.S. voters are satisfied with the government response to the opioid crisis. State the null and alternative hypotheses you would use in both words and symbols.
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A 2003 study of dreaming published in the journal Perceptual and Motor Skills found that out of a random sample of 113 people, 92 reported dreaming in color. However, the proportion of people who reported dreaming in color that was established in the 1940 s was \(0.29\) (Schwitzgebel 2003). Check to see whether the conditions for using a one-proportion z-test are met assuming the researcher wanted to see whether the proportion dreaming in color had changed since the \(1940 \mathrm{~s}\).
According to a Gallup poll, \(11.55 \%\) of American adults have diabetes. Suppose a researcher wonders if the diabetes rate in her area is higher than the national rate. She surveys 150 adults in her area and finds that 21 of them have diabetes. a. If the region had the same rate of diabetes as the rest of the country, how many would we expect have diabetes? b. Suppose you are testing the hypothesis that the diabetes rate in this area differs from the national rate, using a \(0.05\) significance level. Choose the correct figure and interpret the p-value.
A Gallup poll asked college students in 2016 and again in 2017 whether they believed the First Amendment guarantee of freedom of the press was secure or threatened in the country today. In 2016,2489 out of 3072 students surveyed said that freedom of the press was secure or very secure. In 2017,1808 out of 2014 students surveyed felt this way. a. Determine whether the proportion of college students who believe that freedom of the press is secure or very secure in the country changed from \(2016 .\) Use a significance level of \(0.05\). b. Use the sample data to construct a \(95 \%\) confidence interval for the difference in the proportions of college students in 2016 and 2017 who felt freedom of the press was secure or very secure. How does your confidence interval support your hypothesis test conclusion?
Suppose you are testing someone to see whether she or he can tell Coke from Pepsi, and you are using 20 trials, half with Coke and half with Pepsi. The null hypothesis is that the person is guessing. a. About how many should you expect the person to get right under the null hypothesis that the person is guessing? b. Suppose person A gets 13 right out of 20 , and person B gets 18 right out of 20 . Which will have a smaller \(\mathrm{p}\) -value, and why?
The mother of a teenager has heard a claim that \(25 \%\) of teenagers who drive and use a cell phone reported texting while driving. She thinks that this rate is too high and wants to test the hypothesis that fewer than \(25 \%\) of these drivers have texted while driving. Her alternative hypothesis is that the percentage of teenagers who have texted when driving is less than \(25 \%\).$$\begin{aligned} &\mathrm{H}_{0}: p=0.25 \\\&\mathrm{H}_{\mathrm{a}}: p<0.25\end{aligned}$$ She polls 40 randomly selected teenagers, and 5 of them report having texted while driving, a proportion of \(0.125 .\) The p-value is \(0.034\). Explain the meaning of the p-value in the context of this question.
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