PARTD t2s points] Jessica and Sarah collaborate on a study to compare the mean o

Question

PARTD t2s points] Jessica and Sarah collaborate on a study to compare the mean of the JSAT scores for the employees at ABC corporation with the mean of the scores at DEF corporation The following printout shows an analysis of their data: Two-Sample T-Test and CI Sample N Mean StDev SE Nean Difference (ABC) tDEF) Estimate for difference 8.00 354 lower bound for difference 3.80 T-Test of difference 4 tvs T-value 59 P-value 058 DF 58 1. [1 point] Give the number of employees from ABC corporation included in the stud

Explanation / Answer

(14)

The first analysis assumes unequal variances, while the second analysis assumes equal variances of the two samples. This is the reason that in second analysis the term pooled SD comes.

(15)

Yes, this is because for the second test, the p value of 0.048 is less than the significance level of 0.5

So the null hypothesis is rejected in this case.

(16)

The two sided F test is significant, which means that the assumptions of equal varainces cannot hold true here. So we have to tak eunequal variances. So first analysis method should be preferred.

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