1. A systems analyst needs to summarize 1,000,000 documents stored in the repository to assess the effectiveness of the information system. The documents describe end-user usage and (dis)satisfaction. The analyst wants to review the least number possible and avoid, if possible, sampling errors. The population variance for usage is 900 hours hours.

a. How many documents should the analyst select to obtain 100% certainty for estimating the number of hours of usage if the acceptable error is 3 hours. b. How many documents should the analyst select to obtain 95% certainty for estimating the number of hours of usage if the acceptable error is 3 hours. c. If the analyst selected 400 documents for an acceptable error of 2 hours, how many documents should the analyst select for an acceptable error of 4 hours