14 A work sampling study was performed on four account executives in a stort Virtually all sales in the office are made through telephone solicitations observations were made over a period of 1 week (7 hr/day, 5 days/week). The activity and number of observations per category were as follows: (1) teleph (2) filing and sorting, 150; (3) reading and research, 101; (4) personal and n time. 85. Total sales during this period were $525,000, on which the officer mission of 4.0%. (a) Construct a 97% confidence interval on the proportion of time telephone during the 1-week period. (b) Estimate how many hours were spent on by the four account executives during this period. (C) The office is considering hiri at $800/week to do the filing and sorting (category 2). This would reduce the time to the account executives on these activities by 7 hr/day. It is anticipated that all of th 7 hr would be spent on phone calls to increase sales. If sales level (in dollars) found to be proportional to time on the telephone, will the increase in commissions the clerk? Compute the estimated net increase or decrease in weekly revenues from ing the clerk. in a stockbroker's office itations. A total of 5 ). The categories of 1) telephone calls, 164, nal and nonproductive e office earned a com- oportion of time on the were spent on the phone nsidering hiring a clerk the time taken by hat all of these extra (in dollars) has been untuu 14 A work sampling study was performed on four account executives in a stort Virtually all sales in the office are made through telephone solicitations observations were made over a period of 1 week (7 hr/day, 5 days/week). The activity and number of observations per category were as follows: (1) teleph (2) filing and sorting, 150; (3) reading and research, 101; (4) personal and n time. 85. Total sales during this period were $525,000, on which the officer mission of 4.0%. (a) Construct a 97% confidence interval on the proportion of time telephone during the 1-week period. (b) Estimate how many hours were spent on by the four account executives during this period. (C) The office is considering hiri at $800/week to do the filing and sorting (category 2). This would reduce the time to the account executives on these activities by 7 hr/day. It is anticipated that all of th 7 hr would be spent on phone calls to increase sales. If sales level (in dollars) found to be proportional to time on the telephone, will the increase in commissions the clerk? Compute the estimated net increase or decrease in weekly revenues from ing the clerk. in a stockbroker's office itations. A total of 5 ). The categories of 1) telephone calls, 164, nal and nonproductive e office earned a com- oportion of time on the were spent on the phone nsidering hiring a clerk the time taken by hat all of these extra (in dollars) has been untuu