Test the given claim using the $\alpha = 0.05$ significance level and assuming that the populations are normally distributed.
Claim: The treatment population and the placebo population have the same mean.
Treatment group: $n=6,$ $\overline{x}=75,$ $s=7.$
Placebo group: $n=11,$ $\overline{x}=81,$ $s=6.$
The test statistic is
The positive critical value is
The negative critical value is
Is there sufficient evidence to warrant the rejection of the claim that the treatment and placebo populations have the same mean?

A. Yes
B. No