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(For practice only) Will improving customer service result in higher stock prices for the companies providing the better service?
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(a) For Company A, is the increase in the satisfaction score from year 1 to year 2 statistically significant? Use α = 0.05. (Let μ1 = the satisfaction score for year 2 and μ2 = the satisfaction score for year 1.)
H0: μ1 − μ2 ≤ 0
Ha: μ1 − μ2 > 0
p
75.3α
H0: μ ≤ 75.3
Ha: μ > 75.3
p
(c) For Company B, is the increase from year 1 to year 2 statistically significant? Use α = 0.05. (Let μ1 = the satisfaction score for year 2 and μ2 = the satisfaction score for year 1.)
H0: μ1 − μ2 ≤ 0
Ha: μ1 − μ2 > 0
p
(d) When conducting a hypothesis test with the values given for the standard deviation, sample size, and α, how large must the increase from year 1 to year 2 be for it to be statistically significant? (Round your answer to two decimal places.) = ?
