A 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, 2490
of 3099 students surveyed said that freedom of the press was secure
or very secure. In 2017, 1806 of 2037 students surveyed felt
this way. Complete parts (a) and (b).
A. Determine whether the proportion of college students who
believe that freedom of the press is secure or very secure in this
country has changed from 2016. Use a significance level of
0.01.
Consider the first sample to be the 2016 survey, the
second sample to be the 2017 survey, and the number of
successes to be the number of people who believe that freedom of
the press is secure or very secure. What are the null and
alternative hypotheses for the hypothesis test?
B. determine the test statistic. Z=_____ Identify the p-value.
p-value =______
C. Use the sample data to construct a 90% confidence interval
for the difference in the proportion of college students in 2016
and 2017 who felt the press was secure or very secure. How does
your confidence interval support your hypothesis?
the 90% confidence interval is(____,____)