A computer laboratory manager was in charge of purchasing new battery packs for

Question

A computer laboratory manager was in charge of purchasing new battery packs for her lab of laptop computers. She narrowed her choices to two models that were available for her machines. Since the models cost about the same, she was interested in determining whether there was a difference in the average time the battery packs would function before needing to be recharged. She took two independent samples and computed the following summary information:

Battery Pack Model 1

Battery Pack Model 2

Sample Size

9

9

Sample Mean

5 hours

5.5 hours

Standard Deviation

1.5 hours

1.3 hours

Using the following null and alternate hypothesis:
H0:mu1-mu2=0 vs. Ha:mu1-mu2 not equal 0
Test statistic is t=-0.7557
Assume alpha = 0.05 what is the appropriate conclusion for this test?

Reject Ha

Do not reject H0

Reject H0

none of these

Battery Pack Model 1

Battery Pack Model 2

Sample Size

9

9

Sample Mean

5 hours

5.5 hours

Standard Deviation

1.5 hours

1.3 hours

Explanation / Answer

T table = 2.120

Since |t cal| < t tab

We do not reject H0.

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