2. A large firm collects sample data on the lengths of telephone calls (in minutes) made by employees in two different divisions, and the results are as follows. Sales Division Customer Service Division ni= 40 n2=20 Mean=10.26 Mean=6.93 Sı=8.65 S2=4.93 At 0.05 level of significance, test the claim that there is no difference between the mean times of all long-distance calls made in the two divisions. Assume that the population variances are equal.

2. A large firm collects sample data on the lengths of telephone calls (in minutes) made by employees in two different divisions, and the results are as follows. Sales Division Customer Service Division ni= 40 n2=20 Mean=10.26 Mean=6.93 Sı=8.65 S2=4.93 At 0.05 level of significance, test the claim that there is no difference between the mean times of all long-distance calls made in the two divisions. Assume that the population variances are equal.

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section11.4: Collecting Data

Problem 2E

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