What is the 90% confidence interval for the average days worked, population mean, of all payroll departments?
• A sample of 25 different payroll departments found that the employees worked an average of … – A sample of 25 different payroll departments found that the employees worked an average of 310.3 days a year with a standard deviation of 23.8 days. What is the 90% confidence interval for the avera … • Confidence Interval – Which of the following is not needed to be known to calculate a confidence interval? a. standard deviation b. sample size c. mean d. degree of confidence • What does a confidence interval tell us about our population? – What does a confidence interval tell us about our population? • Statistics: Estimate population mean at 90%, 95%, 99% confidence interval – * The UNITE/MORI 2004 survey of student experiences estimated that university students in the UK paid on average $54 per week in accommodation costs. Assume that this average is based on a sample 7 … • Confidence Intervals and Sample Size – 1. A survey of 800 women shoppers found that 17% of them shop on impuls
