Gallup found in 2013 that 58% of Americans worry a great deal or a fair amount about global warming, up from 55% in 2012. Results for this Gallup poll were based on telephone interviews conducted March 7-10, 2013, with a random sample of 1022 adults, aged 18 and older, living in the United States. Does the increase from 2012 to 2013 show a significant increase in concern?

a) Write appropriate hypotheses.

b) Check the assumptions and conditions.

c) Perform the test and find the P-value.

d) State your conclusion.

e) Do you think this difference is meaningful? Explain.