# S 2 Descriptive Statistics Part I: Normal Curves, Variability, and Plotting

This is a three-part assignment related to a study of contraceptive drug use among women. Following is a distribution of systolic blood pressures cross tabulated by age and pill use for women.

View attached instructions for Table 2A. Distribution of systolic blood pressure, cross-tabulated by age and pill use.

Blood Pressure
(mm) Age 35-44
Non-Users Users
% %
Under 90 1 1
91-95 2 1
96-100 5 4
101-105 9 5
106-110 11 7
111-115 15 12
116-120 16 14
121-125 9 11
126-130 10 11
131-135 8 10
136-140 5 7
141-145 4 6
146-150 2 5
151-155 1 3
156-160 1 1
160 and over 1 2
Total Percent 100 100
Total Number 3,494 1,028

First, state whether blood pressure in Table 2A would be a continuous variable or a discrete variable. Explain. Then supposing that the number of women in each of groups (non-users and users) were identified, would the number of women in each category be a continuous variable or a discrete variable? Explain.
Part 2: Use any free online histogram maker* to draw Histograms for the blood pressures of the users and nonusers ages 35 44. Discuss one conclusion that can be made about blood pressure and pill use. *Here are some free resources : Medical Scientist. Kluwer Academic Publishers. Available in Ebrary, accessed via Tridentas online library.

Norman, G., and Streiner, D. (2008). Chapter The Second: Looking at the Data: A first look at Graphing (pages 7-18). In: Biostatistics The Bare Essentials. 3rd Edition. BC Decker Inc. PMPH USA, Ltd. Shelton, CT. eISBN: 9781607950585 pISBN: 9781550093476. Available in Ebrary, accessed via Tridentas online library.

Norman, G., and Streiner, D. (2008). Chapter The Fourth: The Normal Distribution (pages 31-36). In: Biostatistics The Bare Essentials. 3rd Edition. BC Decker Inc. PMPH USA, Ltd. Shelton, CT. eISBN: 9781607950585 pISBN: 9781550093476. Available in Ebrary, accessed via Tridentas online library.