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Test the given claim using the α=0.01 significance level and assuming that the populations are normally...

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=7, x⎯⎯⎯=88, s=5.3. Placebo group: n=9, x⎯⎯⎯=86, s=5.

(a) The test statistic is .

(b) What is the conservative estimate for the degrees of freedom?

(c) The negative critical value is .

(d) The positive critical value is .

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