Suppose that an accounting firm does a study to determine the time needed to complete one person's tax forms. It randomly surveys 175 people. The sample mean is 22.4 hours. There is a known population standard deviation of 6.6 hours. The population distribution is assumed to be normal. If the firm wished to increase its level of confidence and keep the error bound the same by taking another survey, what change should it make? It should increase the number of people surveyed. It should decrease the number of people surveyed. Part (f) If the firm did another survey, kept the error bound the same, and only surveyed 49 people, what would happen to the level of confidence? Why? The level of confidence would be smaller because we have collected a smaller sample, obtaining less accurate information. The level of confidence would be larger because we have collected a smaller sample, obtaining less accurate information. There would be no change. Part (g) Suppose that the firm decided that it needed to be at least 96% confident of the population mean length of time to within one hour. How would the number of people the firm surveys change? Why? The number of people surveyed would decrease because more accurate information requires a smaller sample. The number of people surveyed would increase because more accurate information requires a larger sample. There would be no change