Example 4: Refer to the Business and Society (March 2011) study on the sustainability behaviors of CPA corporations, recall that the level of support for corporate sustainability (measured on a quantitative scale ranging from 0 to 160 points) was obtained for each in a sample of 992 senior managers at CPA (Certified Public Accountant) firms. The data with a higher point value indicate a higher level of support for sustainability. The CEO of a CPA firm claims that the true mean level of support for sustainability is 75 points. But a test is conducted to question this assertation. a. Specify the null and alternative hypotheses for testing this claim. b. For this problem, what is a Type I error? A Type II error? c. The XLSTAT printout shown above gives the results of the test. Locate the test statistic and p-value on the printout. d. At a = .05, give the appropriate conclusion. Inferences Based on a Single Sample XLSTAT 2011.4.02 - One-sample t-test and a-test Theoretical mean: 75 Significance level (9):5 Summary statistics Summary statistics: Variable Observations Minimum Maximum Mean Std. deviation Support 0.0000 155.0000 67.7550 26.8707 One-sample a-test / Two-tailed test: 95% confidence interval on the means (66.0829, 69.4271 Difference -7.2450 z (Obsen -8.492 |z| (Critical value) 1.9600 p-value (Two-tailed]