An investigation of the effectiveness of a training program to improve customer
ID: 3227147 • Letter: A
Question
An investigation of the effectiveness of a training program to improve customer relationships included a pre-training and post-training customer survey. To compare the differences they computed d=(post-training survey score) - (pre-training survey score). Seven customers were randomly selected and completed both surveys. The results follow.
Customer
Pre-training Survey
Post- training Survey
A
4
9
B
5
5
C
10
12
D
7
10
E
6
8
F
5
6
G
2
8
What is the value of the test statistic for d?
Customer
Pre-training Survey
Post- training Survey
A
4
9
B
5
5
C
10
12
D
7
10
E
6
8
F
5
6
G
2
8
An investigation of the effectiveness of a training program to imprave customer relationships included a pre-training and post-training customer survey To compare the differences they computed d post-training survey score) Pre-training survey score) Seven customers were randomly selected and completed both surveys. The results follow. Customer Pre training Survey Fast training Survey A 4 9 KG What is the value of the test statist for d? 2.542 3.359 3.422 3.378 2.905Explanation / Answer
Sample size, n: 7
Difference Mean, d: 2.714286
Difference St. Dev., sd: 2.13809
Test Statistic, t: 3.3588
Critical t: -1.9432
P-Value: 0.9924
90% Confidence interval:
1.143957 < µd < 4.284614
Answer: (B) 3.359
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