The following results are for two independent random samples taken from two populations.

Sample 1

Sample 2

n1 = 50

n2 = 35

 = 13.6

 = 11.6

σ1 = 2.2

σ2 = 3.0

a. What is the point estimate of the difference between the two population means?

b. Provide a 90% confidence interval for the difference between the two population means.

c. Provide a 95% confidence interval for the difference between the two population means.

 

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