Question

Listed below are speeds (müh) measured from traffic on a busy highway. This simple random sample was obtained at 3:30 PM on a wookday Use the sample data to construct a 90% confidence interval estimate of the population standard deviation 60 62 62 56 62 54 59 58 59 68 58 67 - Click the icon to view the table of Chi-Square critical values The confidence interval estimate is mih<o<mih. (Round to one decimal place as needed) Does the confidence interval describe the standard deviation for all times during the week? Choose the correct answer below O A. No. The confidence interval is an estimate of the standard deviation of the population of speeds at 3:30 on a weekday, not other times OB Yes. The confidence interval describes the standard deviation for all times during the week

Answer 1

= 19.675) for the data given S = 4.1001, n = 12, 2=0.10 at x = 0.10 Lois, df = 11 X = XO05,41 X 1-6% = Xogs 4.5748 To find c. I formula (n-1) s' (n-1) s² Kinaſ .95,11 X'ah from 2 (12-1) (4.1001) (12-1) (u. 1000² 4.5748 19.6751 1.514 2 < 3.1398 3.1 1.5 Answer: option (B)