The data in Hypertension.sav contain the results of a study of 409 treated for high blood pressure at the San Diego Student Run Free Clinic (SDSRFC). The variable HTN.Control.Fup takes the values 1 for those who achieved blood pressure control following treatment, and 0 for those who did not.
- a. What is the observed proportion of participants who achieved blood pressure control in this study?
- b. Compute (by hand) a 95% confidence interval for the proportion achieving blood pressure control in this population.
- c. According to data from the NHANES study (http://www.cdc.gov/nchs/data/databriefs/db133.htm), nationwide 52% of people treated for high blood pressure achieve blood pressure control. Use the confidence interval approach to test whether the proportion achieving blood pressure control at SDSRFC is consistent with the national average. (Make sure to state the null and alternative hypothesis, and to interpret your results.)
- d. Use the one-sample z-test to test the hypothesis at question c (compute z-test by hand).
- e. Use the appropriate test in SPSS to test the hypothesis at question c.
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