A survey of 117,156 women who were free of heart disease showed that 31,101 had at least one parent who had suffered a heart attack before age 60. Four years later, 133 of those with a positive family history of heart attack themselves had signs of heart disease, compared with 141 of those whose parent had not suffered a heart attack. (a) State the hypotheses for a one-tailed test to see if positive family history is associated with increased risk. (b) Obtain a test statistic and p-value. Interpret the results. (c) Is normality assured? (d) Is the difference large enough to be important?