SOLUTION: The management of the corporation looking at training issues are not convinced that they should switch to toutside consultants for all of their training programs. They want to look

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Question 136315: The management of the corporation looking at training issues are not convinced that they should switch to toutside consultants for all of their training programs. They want to look at how the two groups compared on the pretest. The relevant data are given below.
Population 1 Population 2
Outside Consultant In House trainer
Sample
Size 30 40
Mean Score on Pretest 4.8 5.2
Std. Dev. on Pretest Score 0.3 0.4
Test to see if there is a mean difference in the pretest scores. Use Alpha 0.05
Ho
H1
Alpha
CV
What Formula?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
The management of the corporation looking at training issues are not convinced that they should switch to toutside consultants for all of their training programs. They want to look at how the two groups compared on the pretest. The relevant data are given below.
.............Population 1.......Population 2
.............Outside Consultant In House trainer
Sample
Size............... 30.................. 40
Mean Pretest Scoret 4.8................. 5.2
StD Pretest Score. 0.3................. 0.4
Test to see if there is a mean difference in the pretest scores. Use Alpha 0.05
Ho: u1-u2 = 0
H1: u1-u2 is not zero
Alpha: 5%
CV: z = +/- 1.96
Comment: I am using z instead of t because the samples are >=30.
What Formula?
z(4.8-5.2) = [(4.8-5.2)-0]/sqrt[s1^2/n1 + s2^2/n2]
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Cheers,
Stan H.