Discussion:
Q1: Testing Claims
(a) write the claim mathematically and identify Ho and Ha,
(b) find the critical value(s) and identify the rejection region(s),
(c) use the x square- test to find the standardized test statistic,
(d) decide whether to reject or fail to reject the null hypothesis, and
(e) interpret the decision in the context of the original claim. For each claim, assume the population is normally distributed..
Q2: Salaries An employment information service says that the standard deviation of the annual salaries for public relations managers is at least
$14,500. The annual salaries for 18 randomly chosen public relations managers are listed. At a = 0.10 can you reject the claim? (Adapted from America's Career InfoNet)
47,517 60,217 39,177 61,744 79,422 70,770
60,549 60,263 72,939 72,372 75,014 59,164
44,811 65,413 61,310 90,433 44,185 41,805