The following data were obtained from two independent samples:

Sample 1: 47.7 46.9 51.9 34.1 65.8 61.5 50.2 40.8

Sample 2: 50.0 47.4 32.7 48.8 54.0 46.3 42.5

1. Determine the 90% confidence interval or interval estimate of the ratio of variances. Is there statistical evidence that the variances of the two samples are equal?

(Answer either Yes or No.)

2. Determine the 95% confidence interval or interval estimate of the difference between the two means. What is the lower limit of the interval estimate?