the water department of a medium-sized city is concerned about how quickly its maintenance crews react to major breaks in the water lines. a random sample of 50 requests for repairs are analyzed and 43 of the 50 requests were responded to within 24 hours. construct a 90% ci for the proportion of requests for repair that are handled within 24 hours. a. to compute the confidence interval, which distribution should you use? why? b. compute the confidence interval. c. interpret the confidence interval in words.