Question

Currently, the staff in the word processing department of a large legal firm cranks out legal documents at the rate of 42 words per minute (wpm). The department manager is considering switching to a new ergonomic keyboard which the manufacturer claims will increase this rate. They will be changeover costs associated with the new keyboard, so the manager does not intend to switch unless presented with evidence which supports the manufacturer claim. An appropriate test setup is H0: mu <= 42 vs. H1: mu > 42, where mu represents the mean wpm with the new keyboard. Test results for a sample of n = 37 staff members who use the new keyboard are Xbar = 41.4 wpm with a standard deviation of s = 3.3 wpm. Calculate the value of the t-statistic that is used to perform the test. Report your answer to at least two decimal places!

Answer 1