Summary statistics are given for independent simple random samples from two populations. Preliminary data analyses indicate that the variable under consideration is normally distributed on each population. Decide whether use of the pooled t-test and pooled t-interval procedure is reasonable. Explain your answer.
Xbar1 = 143.9,
S1 = 45.2,
N1 = 13,
XBar 2= 212.9,
S2 = 155.7,
N2= 15
A: Reasonable; the sample standard deviations suggest that the two population standard deviations differ, however since the sample sizes are roughly equal, it is reasonable to use the pooled t-test.
B: Not reasonable; the sample means suggest that the two population means differ.
C: Not reasonable; the sample standard deviations suggest that the two population standard deviations differ.
D: Reasonable; the sample standard deviations suggest that the two population standard deviations are equal.