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# Point estimates & Confidence interval: Mean Difference

Please explain and show all calculations

1. If two large independent samples are taken from two populations, the sampling distribution of the difference between the two sample means can be determined how?

2. In my BMGT 230 class the fall semester is compared with my class 10 years ago. Please answer the following questions given: This Fall-----------Tens Years Ago Mean 80-------------85 Variance 100--------50 Sample 40-----------60

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

b. the point estimate of the standard deviation of the difference between the means of the two populations is ?

c. the 95% confidence interval for the difference between the two population means is?

#### Solution Summary

The solution provides step by step method for the calculation of confidence interval for difference between population means. The solution also provides method for the calculation of point estimates of mean difference and standard deviation of the mean difference. Formula for the calculation and Interpretations of the results are also included.

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