Chapter 10, Section 10.3, Problem 22 Your answer is partially correct. Try again

Question

Chapter 10, Section 10.3, Problem 22 Your answer is partially correct. Try again. The data on the weight (lb) of male and female wolves, from Table D.9 of the Data Bank, are Female 57 8490 71 717768 73 Male 71 93 101 84 88 117 86 86 93 86 106 (a) Test the null hypothesis that the mean weights of males and females are equal versus a two-sided alternative. Take = 0.05. The null hypothesis rejected at = 0.05. (b) Obtain a 95% confidence interval for the difference of population mean weights. 26.3 7.5 The 95% confidence interval is ( pounds. [Round your answers to 1 decimal place.

Explanation / Answer

The statistical software output for this problem is:

Two sample T confidence interval:
1 : Mean of Female
2 : Mean of Male
1 - 2 : Difference between two means
(without pooled variances)

95% confidence interval results:

Hence,

95% confidence interval will be:

(-28.9, -7.1)

Difference Sample Diff. Std. Err. DF L. Limit U. Limit 1 - 2 -18.034091 5.1569389 16.715341 -28.928413 -7.1397692

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