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Exercise 2. The following information is based on independent random samples taken from two normally distributed...

Exercise 2. The following information is based on independent random samples taken from two normally distributed populations having equal variances:

Sample 1

Sample 2

n1= 15

n2= 13

x1= 50

x2= 53

s1= 5

s2= 6

Based on the sample information, determine the 90% confidence interval estimate for the difference between the two population means.

Math   Statistics-And-Probability   
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Answer #1

the pooled standard deviation be:

degrees of freedom :-

t critical value for 90% confidence level be:-

[ from t distribution table, for df=26,alpha=0.10, both tailed test]

the 90% confidence interval estimate for the difference between the two population means be:-

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