Question

Given two independent random samples with the following results:

n1=17

x‾1=185

s1=22

   

n2=12

x‾2=150

s2=15

Use this data to find the 98%

confidence interval for the true difference between the population means. Assume that the population variances are not equal and that the two populations are normally distributed.

Step 1 of 3 : Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places.

Answer 1

degrees of freedom be:-

a).t critical value for df=26,alpha=0.02, both tailed test be:-

[ using t distribution table ]

b).the point estimate of difference be:-

c).the 98% confidence interval for the true difference between the population means is :-

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