The following chart compares the average Land-Surface Air Temperatures for year since 1961 to the 20^th century average Land-Surface Air Temperature.

At the ? = 0.05 significance level, conduct a hypothesis test for the claim that the mean Land-Surface Air Temperature has not changed (? = 0).Be sure to include your hypotheses, the critical value(s), the standardized test statistic, and your initial and final conclusions.

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