Twelve different video games showing substance employ were observed and duration times of game play (in seconds) are listed below. The design of study justifies the assumption that the sample can be treated as simple random sample. Employ the data to develop a 99% confidence interval estimate of ?, the mean duration of game play. 4053 3889 3862 4037 4325 4822 4654 4026 5012 4824 4343 4308 What is the confidence interval estimate of the population mean ?? Please show how to get the sample standard deviation by steps? I am only confuse to how to get the answer for s.