Comparing Two Population Means (matched
... Twenty-four males age 25-29 were selected from the Framingham Heart Study. Twelve were smokers and 12 were nonsmokers. The subjects were paired, with one being a smoker and the other a nonsmoker. Otherwise, each pair was similar with regard to age and physical characteristics. Systolic blood pressur ...
... Twenty-four males age 25-29 were selected from the Framingham Heart Study. Twelve were smokers and 12 were nonsmokers. The subjects were paired, with one being a smoker and the other a nonsmoker. Otherwise, each pair was similar with regard to age and physical characteristics. Systolic blood pressur ...
Class 11 Lecture: t-tests for differences in means
... treated as “large” in most cases • Total N (of both groups) < 100 is possibly problematic • Total N (of both groups) < 60 is considered “small” in most cases • If N is small, the sampling distribution of mean difference cannot be assumed to be normal • Again, we turn to the T-distribution. ...
... treated as “large” in most cases • Total N (of both groups) < 100 is possibly problematic • Total N (of both groups) < 60 is considered “small” in most cases • If N is small, the sampling distribution of mean difference cannot be assumed to be normal • Again, we turn to the T-distribution. ...
ttest - Stata
... Hamilton, L. C. 2013. Statistics with Stata: Updated for Version 12. 8th ed. Boston: Brooks/Cole. Hoel, P. G. 1984. Introduction to Mathematical Statistics. 5th ed. New York: Wiley. Pearson, E. S., R. L. Plackett, and G. A. Barnard. 1990. ‘Student’: A Statistical Biography of William Sealy Gosset. ...
... Hamilton, L. C. 2013. Statistics with Stata: Updated for Version 12. 8th ed. Boston: Brooks/Cole. Hoel, P. G. 1984. Introduction to Mathematical Statistics. 5th ed. New York: Wiley. Pearson, E. S., R. L. Plackett, and G. A. Barnard. 1990. ‘Student’: A Statistical Biography of William Sealy Gosset. ...
