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The report "Audience Insights: Communicating to Teens (Aged 12-17)" (www.cdc.gov, 2009) de- scribed teens' attitudes about traditional media, such as TV, movies, and newspapers. In a representative sample of American teenage girls, 41% said newspapers were boring. In a representative sample of American teenage boys, 44% said newspapers were boring. Sample sizes were not given in the report.
a. Suppose that the percentages reported had been based on a sample of 58 girls and 41 boys. Is there convincing evidence that the proportion of those who think that newspapers are boring is different for teenage girls and boys? Carry out a hypothesis test using CY = .05.
b. Suppose that the percentages reported had been based on a sample of 2000 girls and 2500 boys. Is there convincing evidence that the proportion of those who think that newspapers are boring is differ- ent for teenage girls and boys? Carry out a hypoth- esis test using CY = .05.
c. Explain why the hypothesis tests in Parts (a) and (b) resulted in different conclusions.
1. which of the following statements are true? could be more than onea. a single observational study is efficient at
for the standard normal distribution shown on the right find the probability of z occuring in the indicated region.its
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Find the p-value of a two-tailed test if x (x bar) =51.8 and s =10.4. P= ___ (rd. to 4 dec. places). Find the p-value of an upper-tailed test if x (x bar) = 51.8 and s= 10.4. P= ___ (rd. to 4 dec. places)
The rest have no opinion. " Suppose that a a sample of 100 American adults is quizzed on the subject. What is the probability of the following events?
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