A researcher predicts that the percentage of people who do not watch TV is higher now than before the advent of the Internet. Let p1 denote the population proportion of American adults in 1975 who reported watching no TV. Let p2 denote the corresponding population proportion in 2008.
a. Set up null and alternative hypotheses to test the researcher’s prediction.
b. According to General Social Surveys, 57 of the 1483 subjects sampled in 1975 and 87 of the 1324 subjects sampled in 2008 reported watching no TV. Find the sample estimates of p1 and p2.
c. Show steps of a significance test. Explain whether the results support the researcher’s claim.