Twelve different video games showing substance use were observedand the duration of times of game play​ (in seconds) are listedbelow. The design of the study justifies the assumption that thesample can be treated as a simple random sample. Use the sampledata to construct an 80​% confidence interval estimate of sigma​,the standard deviation of the duration times of game play. Assumethat this sample was obtained from a population with a normaldistribution. 4251 4261 4551 4691 4423 4 728 4797 4473 4421 44963949 4524
The confidence interval estimate is blank sec <
