Question

To see favorites here, select then and drag to the Favorites llar folder. Oreport from another browser porta 7. 4 POINTS BBUNDERSTAT12 7.4.011. MY NOTES ASK YOUR TEACHER Inorganic phosphorous is a naturally occurring element in all plants and animals, with concentrations increasing progressively up the food chain (fruite vegetables cereals nuts corpse). Geochemical surveys take soll samples to determine phosphorous content (in ppm, parts per million). A high phosphorous content may or may not indicate an andent burial site, food storage site, or even a garbage dump. Thell of Tara is a very important archaeological site in Ireland. It is by legend the seat of Ireland's andent kings. Independent random samples from two regions in Tara gave the following phosphorous measurements (ppm). Assume the population distributions of phosphorous are mound shaped and symmetric for these two regions. Region 11 i 12 540 810 790 790 890 860 820 640 340 800 970 720 Region 11 12 16 750 870 700 810 965350895850 635 955 710 890 520 650 280 993 (a) Use a calculator with mean and standard deviation keys to calculate X1.1.X2, and (Round your answers to one decimal place) confidence interval for Round your answers to one decimal place.) (D) Let be the population mean for Xi and let w be the population mean for 2. Find an upper limit

Answer 1

deviation from given sol ten we have to calculate near and standard mean x = xilo - 540 +810+ -- +720/12 standard deviatin sa = 747.5 E (Xi-8 ハート (sub-767.5)2 + -- + ( 720-747.5)2 12-1 Si = 170.4 mean I = Exlo = 7504870+ -. $99316 738.9 stondard deviation S = (250–738.9)-+--+(993-738.9)2 16-) S2 = 212.1 *77=707.5 Si= 170.4 | : 738.9 L = 212.11 Confidence Intewal is 80%. a = 10.80 = 0.20 6 dp- nit23-2 =12+16-2 -26 807. Critical value of tole de to:2/2, 26 = 1.315 Confidence Intence is given by c5 = (-1, ) Italy, of ( ) - (707.5 - 738.9) + 1.815 = 8.6 € 1.318 ( 10.328 ) - 8.6 + 95.1132 lower limit = 8. 695. 11132 = -86.5 (round to ideanal) upper Cmit 816 + 95.11132 : 103.7 212,12