* do-file for Supplementary Exercises 7.73 and 7.74 of IPS7e
version 17 /* works also with versions 13-16 */

import delimited "R:\Chapter 7\ex07_073.csv", clear

* 7.73
stem phos
summarize phos, detail
ci phos, level(90)

* 7.74
ttest phos=4.8