Discuss the below:
Q: A researcher was interested in determining whether corporate executives who exercised regularly scored lower than corporate executives in general on a scale of stress symptoms. For corporate executives in general, the average on this test is 80 with a standard deviation of 12. The researcher then measured 20 executives who exercised and found them to have a mean score of 72.
Is this difference significant at the .05 level?
What is the comparison distribution and what are its characteristics (include the sample size, mean, variance, and standard deviation)?
What will be the cutoff Z-score necessary to reject the null hypothesis at p< .05? What is the Z-score of the sample?
State your decision in terms of accepting or rejecting the null hypothesis. Justify your decision