A sports reporter wishes to establish the mean satisfaction level (on a scale from 0 to 10)
Question:
A sports reporter wishes to establish the mean satisfaction level (on a scale from 0 to 10) to within a margin of error of 0.5. If it is known from previous studies that the standard deviation in the level of fan satisfaction is 2.8, what sample size will be needed to achieve the desired precision with 98% confidence?
Round up to the next whole number
An HR administrator wishes to know the proportion of employees that are currently using a very costly benefit to determine if it is still considered valuable by the staff. If the administrator has no preliminary notion of the proportion of employees using the benefit, how big a sample must she collect to be accurate within 0.12 at the 95% level of confidence?
Round up to the next whole number
Statistics for Business and Economics
ISBN: 978-0132930192
8th edition
Authors: Paul Newbold, William Carlson, Betty Thorne