A scientist estimates that the mean carbon dioxide emissions per country in a recent year are greater
Question:
A scientist estimates that the mean carbon dioxide emissions per country in a recent year are greater than 150 megatons. You want to test this estimate. To do so, you determine the carbon dioxide emissions for 42 randomly selected countries for that year. The results (in megatons) are shown in the table at the left. Assume the population standard deviation is 816 megatons. At α = 0.06, can you support the scientist’s estimate?
(a) Identify the claim and state H0 and Ha,
(b) Find the critical value(s) and identify the rejection region(s),
(c) Find the standardized test statistic z,
(d) Decide whether to reject or fail to reject the null hypothesis, and
(e) Interpret the decision in the context of the original claim.
Step by Step Answer:
Elementary Statistics Picturing The World
ISBN: 9780134683416
7th Edition
Authors: Ron Larson, Betsy Farber