Given two independent random samples with the following results:
n1=6x‾1=131s1=14n n2=11x‾2=109s2=10
Use this data to find the 99%99% confidence interval for the true difference between the population means. Assume that the population variances are 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.
The statistic software output for this problem is:

Critical value = 2.947
The 99% confidence interval is :
(4.818 , 39.182)
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