Question:

The following data are taken from a submitted paper: Nierenberg DW, Stukel TA, Karagas MR and the Micronutrient Study Group. The effects of dietary factors and personal characteristics on plasma concentrations of retinol, alpha-tocopherol and five carotenoids. Based on the tables (T test and means) answer the following questions.

a. The T test compares calories consumed per day for males and females. What type of T test is this?

b. What are the assumptions of this T test (what is assumed to be true about the data)?

c. State the null and alternate hypothesis (2 tailed) in terms of the actual measurements.

d. Interpret the results of the T test. Describe what this means about caloric intake?

e. What is the meaning of the 95% confidence interval?