Inferential Statistics
An independent t test was used to test for differences between groups. This test assumes normality and homogeneity of variance. Although the distributions are not quite normal, they are not so deviant as to make the test invalid. The standard deviations for the average weight and overweight conditions are 9.86 and 9.65 respectively. Therefore there is no reason to suspect a violation of the homogeneity of variance assumption.
The difference between means is significant, t(69) = 2.856, p = 0.0057. The
95% confidence interval on the difference between means extends from 1.9980
to 11.2556 Therefore, there is strong evidence that physicians expect to spend
less time with overweight patients.