Twelve different video games showing substance use were observed and the duration of times of game play in seconds are listed. The design of the study justifies the assumption that the sample can be treated as a simple random sample. Use the sample data to construct an 80% confidence interval estimate of standard deviation of the duration times of game play. Assume that this sample was obtained from a population witha normal distrubtion.
4636 4961 4151 4803 3850 4613
4414 4573 4022 4990 4930 3846
The confidence interavl estimate is _ sec< SD<___sec round to one decimal.