Question

In a sample of 200 households, the mean number of hours spent on social networking sites during the month of January was 55 hours. In a much larger study, the standard deviation was determined to be 7 hours. Assume the population standard deviation is the same. What is the 99% confidence interval for the mean hours devoted to social networking in January?

Answer 1

The answer to the statistics question above would be ± 1.27. Thus, the confidence interval for the mean hours devoted to social networking in January is equated to 1.27 above or below. Thus, the true population mean would range around 53.73 to 56.27 hours.