Test the given claim using the α=0.01 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, x¯=119,
s=5.8.
Placebo group: n=13, x¯=112, s=5.6.
(a) The test statistic is .
(b) What is the conservative estimate for the degrees of freedom? df =
(c) The negative critical value is .
(d) The positive critical value is .
(e) Is there
sufficient evidence to warrant the rejection of the claim that the
treatment and placebo populations have the same mean?
A. No
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