Repeat Problem 10.12 (a), assuming that the population variances in the two branches are not equal. Compare these results with those of Problem 10.12 (a). Problem 10.12 (a)

t Test for Differences in Two Means
Data
Hypothesized Difference		0
Level of Significance		0.05
Population 1 Sample
Sample Size		15
Sample Mean		4.286667
Sample Standard Deviation		1.637985
Population 2 Sample
Sample Size		15
Sample Mean		7.114667
Sample Standard Deviation		2.082189
Intermediate Calculations
Population 1 Sample Degrees of Freedom		14
Population 2 Sample Degrees of Freedom		14
Total Degrees of Freedom		28
Pooled Variance		3.509254
Difference in Sample Means		-2.828
t-Test Statistic		-4.13431
Two-Tailed Test
Lower Critical Value		-2.04841
Upper Critical Value		2.048409
p-Value		0.000293
Reject the null hypothesis