Listed below are speeds (mih) measured tron trafic on a busy highway. This simple random sample was obtained at 3:30 PM. on a weekday. Use the sample data to construct an 80% confidence interval estimate of the population standard deviation. 606464555454595959696268 Click the icon to view the table of Ch-Square crical values The confidence interval estimate is mitheer mith (Round lo one decimal place ss needed).