Question

Twelve different video games showing substance use were observed and the duration of times of game play​ (in seconds) are listed below. 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 a 99​% confidence interval estimate of sigma​, the standard deviation of the duration times of game play. Assume that this sample was obtained from a population with a normal distribution. 4 comma 238 4 comma 652 3 comma 898 4 comma 337 4 comma 132    3 comma 836 3 comma 894 4 comma 328 4 comma 179 3 comma 864 4 comma 918 3 comma 944 LOADING... Click the icon to view the table of​ Chi-Square critical values. The confidence interval estimate is nothing secless thansigmaless than nothing sec. ​(Round to one decimal place as​ needed.)

Answer 1

confidence interval of standard deviation =216.5 < σ <694.2