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A study reported in the journal of occupational and organizational psychology investigated the relationship of employment status to mental health. Each in a sample of 49 unemployed men was given a mental health exam using the General Health Questionnaire. The GHQ is a widely recognized measure of present mental health, with lower values indicating better mental health. The mean and standard deviation of the GHQ scores were x = 10.94 and s = 5.10 respectively.
a.) Specify the appropriate null and alternative hypotheses if we wish to test the research hypothesis that the mean GHQ score for all employed men exceeds 10.
b.) If we specify alpha = 0.05 what is the appropriate rejection region for this test?
c.) Conduct the test, state your conclusion clearly in the language of this exercise.
Draw a scatter diagram and consider the correlation for the provided data. Do larger universities tend to have more property crime.
If Stephenson wishes to maximize its total market value, would you recommend that it issue debt or equity to finance the land purchase? Explain.
What is the probability that they all hit the target?
In a sample of 1200 police officers, the mean annual salary was $33,000 and the standard deviation was $3200. A random sample of size 70 is drawn from this population. What is the probability that the mean annual salary is between $32,000 and $32,..
Prepare tables of descriptive statistics (mean, median, Quartiles, IQR, and Standard Deviation) by firm for net profit margin (PROFITS). Discuss.
One professor teaches a large section, section A, of a particular class, and on the first test of the term, the test scores in section A were approximately normally distributed with a mean of 78 and a standard deviation of 6.
A ski company in Vail owns two ski shops, one on the east side and one on the west side. Sales data showed that at the eastern location there were 56 pairs of large gloves sold out of 304 total pairs sold.
A law student, who want to check a professor's claim that convicted embezzlers spend on average 12.3 months in jail, takes a random sample of 36 such cases from court files.
How to explain the influences on z-scores with constant variables in hypothesis tests with
The International Coffee Association has reported the mean daily coffee consumption for U.S. residents as 1.65 cups. Assume that a sample of 38 people from a North Carolina city consumed a mean of 1.84 cups of coffee per day
Draw the scatter diagram. Does it appear that x and y are related? If so, how? Test to determine whether there is evidence of a linear relationship
Use this information to make a 95% confidence interval to evaluate true average number of copies made each day at this company.
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