A study was done using a treatment group and a placebo group. The results shown

Question

A study was done using a treatment group and a placebo group. The results shown in the Assume that the two samples are independent simple H H1 H2 random selected from normally populations, and do not n 26 38 distributed assume that the population standard deviations are equal. parts (a) x 232 261 and (b) below. Use a 0.01 significance level for both parts. The P-value is 0.139 (Round to three decimal places as needed.) State the conclusion for the test. Reject the null hypothesis. There is not sufficient evidence to warrant rejection of the claim that the two samples are from populations with the same mean. Fail to reject the null hypothesis. There is not sufficient evidence to warrant rejection of the claim that the two samples are from populations with the same mean. Reject the null hypothesis. There is sufficient evidence to warrant rejection of the claim that the two samples are from populations with the same mean. Fail to reject the null hypothesis. There is sufficient evidence to warrant rejection of the claim that the two samples are from populations with the same mean.

Explanation / Answer

Not eq. vars: No Pool (and df calculated with Formula 9-1)

Alternative Hypothesis:
µ1 not equal µ2

Test Statistic, t: -1.5003
Critical t: ±2.707691
P-Value: 0.1416

Degrees of freedom: 39.0622

99% Confidence interval:
-0.8133916 < µ1-µ2 < 0.2333916

(a) p- value = 0.142

(b) Option B.

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