Management at the Fresno Manufacturing Company claims the mean income for all new workers is a large company equals $850 per week. An employee decides to test this claim, believing it is actually less than $850 per week. For a random sample of 225 workers (n), the sample weekly income is $770. The sample standard deviation (sx) is equal to $90. Assume an alpha = .05.
(a) State the null and research hypotheses. _____
(b) State the level of significance. _____
(c) State the formula for the test-statistic you will use (and df, if appropriate). _____
(d) Determine your critical test-statistic score. _____
(e) Calculate your research test-statistics score. _____
(f) Interpret your findings in the context of the problem. _____