A law enforcement agent thinks that at least 88% of the drivers stopped upon Saturday nights for speeding are under the influence of alcohol. A sample of 66 drivers who were stopped for speeding on Saturday night was taken. Eighty percent of the drivers in the sample were under the affect of alcohol.
a. Determine the null and alternative hypotheses.
b. Calculate the test statistic.
c. Using the p-value approach, test the hypotheses at the .05 level of significance.