B1. For the exercises in this chapter, you will again be using the SPSS dataset Polit2SetB. First, run a descriptive analysis for the variable bmi, the body mass index for study participants.

Do this within Analyze ➜ Descriptive Statistics ➜

Descriptives. Move the variable bmi (variable #19) into the variable list, then click the pushbutton for Options. Select the following statistics: mean, standard deviation, minimum, maximum, and standard error (S. E. mean). Then click Continue and OK to run the analysis and answer the following questions:

(a) What is the mean body mass index in this sample of low-income women?

(b) What is the SD?

(c) What is the standard error of the mean?

(d) Using the SEM and values from the t distribution in Table 2 of Appendix: Theoretical Sampling Distribution Tables, compute the value of the 95% CI around the mean. Now, what is the value of the 99% CI around the mean for BMI?