A career counselor claims that the mean annual salary of entry-level paralegals in Peoria, Illinois, and Gary,
Question:
A career counselor claims that the mean annual salary of entry-level paralegals in Peoria, Illinois, and Gary, Indiana, is the same. The mean annual salary of 40 randomly selected entry-level paralegals in Peoria is $50,410. Assume the population standard deviation is $9320. The mean annual salary of 35 randomly selected entry-level paralegals in Gary is $47,350. Assume the population standard deviation is $9330. At α = 0.10, is there enough evidence to reject the counselor’s claim?
(a) Identify the claim and state H0 and Ha,
(b) Find the critical value(s) and identify the rejection region(s),
(c) Find the standardized test statistic z,
(d) Decide whether to reject or fail to reject the null hypothesis, and
(e) Interpret the decision in the context of the original claim. Assume the samples are random and independent, and the populations are normally distributed.
Step by Step Answer:
Elementary Statistics Picturing The World
ISBN: 9780134683416
7th Edition
Authors: Ron Larson, Betsy Farber