Question

Listed below are speeds (mi/h) measured from traffic on a busy highway. This simple random sample was obtained at 3:30 P.M. on a weekday. Use the sample data to construct a 98% confidence interval estimate of the population standard deviation. 65 62 62 56 62 54 60 59 60 69 61 67 Click the icon to view the table of Chi-Square critical values. mi/h. The confidence interval estimate is mi/h (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. B. Yes. The confidence interval describes the standard deviation for all times during the week. O

Answer 1

we have yet z= given n= 12 observations = observations. [65, 62, 62, 56, 62, 54, 60,59 60, 69, 61, 671 98% confidence interval estimate standard deviation =o.. of the population ma Formula - Sample For Jozi na 2212 here first we need to calculate sample mean of sample variance (32)

617 - 1) +. . - 621 +2) + یيح = ع = ع (2 10 4 16G | = = 134 رو، ۱ ۱۰۹ - 67) 34 (6 ۱۷ به 61 - 65)C ) = (3 - 1) + (61 - ۱۰۹ ۱۵۰۴] . + ۱۱ ل =ح ماه 1 . ۹) = ۹۱64 ۹۵۰ ا = | دا23 - ۱۵ 4 . 5 / 5 ال = عمل دی

er bor 2 = lower wunda | Conse iranza Longa tool [224 425) - share a St. 42822, 82] upper bunda saman en beplande = to ea le 28s7s| I qala 2-822 U1 +17.9015) 24-25 y 2 (* 17-9015) 3.0535 E 8.0302 )

here of = Ot= 107-1 = 106 F = 1 105 523 to zi df = tool, 100 F 1 2.623 = ( 98-+ 62.623 # of it = ( 487 01825] = [ 98.5174, 98.8825] say we can lies within 99% confident that 98.517 to 98.882 . population mean in 98.517 OF <H < 48.882 °F)

® the suggest that the mean body temperature could very possible be 98.6°F . claim males the standard deviation of plse rates of adult less than 12 bpm. n=137. s= 10.8. in the rest stahishic : T= T= 136+ ( 1038 )? 10.46 | 12