1.)A In the first year of the study, 359 randomly selected Americans were surveyed, with 233 reporting concern about climate change. In the second year, 194 out of 352 randomly selected Americans expressed concern about climate change. Test the claim that the underlying population proportions are different, using a 1% level of significance.

a)What are the hypotheses for this test? What is the level of significance?

b)Is this a one- or two-tailed test?

c)Compute the z-test statistic for this test.

d)Determine the P-value for the test.

e)Make and justify a decision. What is your conclusion?

2.)A car magazine wants to test to determine if the 2015 SUV model of a certain brand has better gas mileage than the 2014 model. A significance level of 0.05 has been selected.

2.) A car magazine wants to test to determine if the 2015 SUV model of a certain brand has better gas mileage than the 2014 model. A significance level of 0.05 has been selected. n I S 2014 38 20.51 2.01 2015 43 21.77 2.56