(a) What test should be used? (b) Calculate: p-value = , and d.f. = (c) At 5% significance level, your decision is: (d) Is there sufficient evidence to conclude that the mean salary of younger employees is less than the mean salary of older employees at this company?
19)
A Human Resources director was interested in comparing the salaries of younger (age 22-30) and older (age 31-40) employees at her company. A random samples of 8 younger employees and 9 older employees yielded the following hourly salaries (in $).
Younger 35 25 28 37 23 18 41 32
Older 22 29 40 24 36 34 33 28 31
At the 5% significance level, do the data provide sufficient evidence to conclude that the mean salary of younger employees is less than the mean salary of older employees at this company? Assume that the variances are the same.
(a) What test should be used?
(b) Calculate: p-value = , and d.f. =
(c) At 5% significance level, your decision is:
(d) Is there sufficient evidence to conclude that the mean salary of younger employees is less than the mean salary of older employees at this company?
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