Does lovastatin (a cholesterol-lowering drug) reduce the risk of heart attack? In a Texas study, researchers gave lovastatin to 2,325 people and an inactive substitute to 2,081 people (average age 58). After 5 years, 57 of the lovastatin group had suffered a heart attack, compared with 97 for the inactive pill. (a) State the appropriate hypotheses. (b) Obtain a test statistic and p-value. Interpret the results at significant level = .01. (c) Is normality assured? (d) Is the difference large enough to be important? (e) What else would medical researchers need to know before prescribing this drug widely? (Data are from Science News 153 [May 30, 1998], p. 343.)
a) State the appropriate hypotheses.
H0: p1 = p2
Ha: p1 < p2
b) Obtain a test statistic and p-value. Interpret the results at α = .01.
P = =
Q = 1- 0.035 = 0.965
Thus the value of the test statistic ...
The solution determines if lovastatin reduces the risk of a heart attack.