THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
A sample of 25 bottles is taken from the production line at a local bottling plant.Assume that the fill amounts follow a normal distribution.
-The length of time it takes a stock analyst to complete an evaluation of a company's earnings forecast is normally distributed with a mean of 6.7 hours.From looking at the time spent by an analyst evaluating 36 randomly selected stocks you find that the sample mean was 6.4 hours.If you are told that the probability of getting a sample mean this small or smaller is 0.10,what must the population standard deviation have been?

Question

Quizplus · Accepted Answer

The Answer of THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
A sample of 25 bottles is taken from the production line at a local bottling plant.Assume that the fill amounts follow a normal distribution.
-The length of time it takes a stock analyst to complete an evaluation of a company's earnings forecast is normally distributed with a mean of 6.7 hours.From looking at the time spent by an analyst evaluating 36 randomly selected stocks you find that the sample mean was 6.4 hours.If you are told that the probability of getting a sample mean this small or smaller is 0.10,what must the population standard deviation have been?