In a questionnaire, a random sample of students were asked whether they studied for more than four hours to prepare for an upcoming chapter test. The questionnaire resulted in a sample proportion of p ′ = 0.58 , with a sampling standard deviation of σ p ′ = 0.11 , who studied more than four hours. Using the empirical rule, write a 99.7 % confidence interval for the true proportion of students who studied for more than four hours.