Consider the following results for two samples randomly taken from two populations.

Sample A Sample B

Sample Size 150 150

Sample Mean 412 405

Sample Std Deviation 128 54

A. At a .01 level of significance, test whether there is a difference between the 2 sample means.

b. Construct a 99 percent confidence interval estimate of the difference between the two sample means.

Sample A Sample B

Sample Size 150 150

Sample Mean 412 405

Sample Std Deviation 128 54

A. At a .01 level of significance, test whether there is a difference between the 2 sample means.

b. Construct a 99 percent confidence interval estimate of the difference between the two sample means.