Answer Happy

A Stat 510 student works at the IT Help Desk at Hale Library. For several weeks, the student recorded how long it took to solve the walk-in problems she attended. A random sample of n= 14 walk-in problems was selected and times are listed below. 18.60 19.30 18.48 12.88 17.02 14.62 17.36 17.50 22.18 22.17 17.51 18.92 19.52 20.31

12. To make staffing decisions, the IT Help Desk supervisor wants to estimate the mean time it takes for each Help Desk worker to solve a walk-in problem within £ 60 seconds margin of error. We will use the information from the 35 recorded times from the previous question to get the values we need. If the supervisor wants to use a 98% margin of error, how many measurements he needs to collect from each worker? Think about the assumptions you need to make. Hint: For sample size calculations we need to use the margin of error formula for KNOWN variance. The sample variance helps. Don't forget to check the units of measurement and to round up.