The data in NutritionStudy, introduced in Exercise 1.13 on page 13, include information on nutrition and health habits of a sample of 315 people. One of the variables is VitaminUse, indicating whether a person takes a multivitamin pill regularly or occasionally or not at all. Use technology to test whether the data provide evidence that the proportion taking a vitamin pill regularly is different from 35%.

Exercise 1.13 on page 13

The data from a study examining the association between diet and plasma retinol and beta-carotene levels are given in NutritionStudy. The data include 315 observations and 16 variables that are described in Appendix B on page 691.