Corporate sustainability of CPA firms. Refer to the Business and Society (March 2011) study on the sus- tainability behaviors of CPA corporations, Exercise 6.12 (p. 308). 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 scnior manage rs at CPA firms. The data (where higher point values indicate a higher level of support for sustain- ability) are saved in the accompanying file. The CEO of a CPA firm claims that the true mean level of support for sustainability is 75 points. a. Specity the null and alternative hypotheses for testing this claim. b. For this problem, what is a Type I error? A Type II error? e. The XLSTAT printout on the following page gives the results of the test. Locate the test statistic and p-value on the printout. d. At a- 05, give the appropriate conclusion. e. What assumptions, if any, about the distribution of sup- port levels must hold true in order for the inference derived from the test to be valid? Explain. B XLSTAT 2011.4.02 - One-sample t-test and z-test Theoretical mean: 75 Significance level (%): 5 Summary statistics Summary statisties: Variable Observations Minimum Maximum Mean Std. devistion Suppert 992 0.0000 155.0000 67.7550 26.3707 One-sample 2-test / Two-tailed test: 95% confidence interval on the mean: ( 66.0829, 69.4271) Difference -7.2450 2 (Obsorved value) 12) (Critical value) p-value (Two-tailad) alpha -8.4923 1.9600 <0,0001 0.05

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Corporate sustainability of CPA firms. Refer to the
Business and Society (March 2011) study on the sus-
tainability behaviors of CPA corporations, Exercise 6.12
(p. 308). Recall that the levcl 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 scnior managers at CPA firms. The datsa (where higher
paint values indicate a higher level of support for sustain-
ability) are saved in the accompanying file. The CEO of a
CPA firm claims that the true mean level of support for
sustainability is 75 points.
a. Specity the null and alternative hypotheses for testing
this claim.
b. For this problem, what is a Type lerror? A Type II error?
c. The XLSTAT printout on the following page gives the
results of the test. Locate the test statistic and p-value
on the printout.
05, give the appropriate conclusion.
e. What assumptions, if any, about the distribution of sup-
port levels must hold true in order for the inference
derived from the test to be valid? Explain.
d. At a
XLSTAT 2011.4.02 - One-sample t-test and z-test
Theoretical mean: 75
Significance level (%): 5
Summary statistics
Summary statisties:
Variable
Observations Minimum Maximum
Mean
Std. devistion
Suppert
992
0.0000 155.0000
67.7550
26.8707
One-sample 2-test / Two-tailad test:
95% confidence interval on the mean:
( 66.0829, 69.4271)
Dfference
-7.2450
2 (Obsorved value)
12) (Critical value)
p-value (Two-tailad)
alpha
-8.4923
1.9600
<0.0001
0.05
XLSTAT output for Exercise 732
Transcribed Image Text:Corporate sustainability of CPA firms. Refer to the Business and Society (March 2011) study on the sus- tainability behaviors of CPA corporations, Exercise 6.12 (p. 308). Recall that the levcl 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 scnior managers at CPA firms. The datsa (where higher paint values indicate a higher level of support for sustain- ability) are saved in the accompanying file. The CEO of a CPA firm claims that the true mean level of support for sustainability is 75 points. a. Specity the null and alternative hypotheses for testing this claim. b. For this problem, what is a Type lerror? A Type II error? c. The XLSTAT printout on the following page gives the results of the test. Locate the test statistic and p-value on the printout. 05, give the appropriate conclusion. e. What assumptions, if any, about the distribution of sup- port levels must hold true in order for the inference derived from the test to be valid? Explain. d. At a XLSTAT 2011.4.02 - One-sample t-test and z-test Theoretical mean: 75 Significance level (%): 5 Summary statistics Summary statisties: Variable Observations Minimum Maximum Mean Std. devistion Suppert 992 0.0000 155.0000 67.7550 26.8707 One-sample 2-test / Two-tailad test: 95% confidence interval on the mean: ( 66.0829, 69.4271) Dfference -7.2450 2 (Obsorved value) 12) (Critical value) p-value (Two-tailad) alpha -8.4923 1.9600 <0.0001 0.05 XLSTAT output for Exercise 732
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