An Introduction to Statistical Methods and Data Analysis
7th Edition
ISBN: 9781305269477
Author: R. Lyman Ott, Micheal T. Longnecker
Publisher: Cengage Learning
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Inorganic phosphorous is a naturally occurring element in all plants and animals, with concentrations increasing progressively up the food chain (fruit < vegetables < cereaise
nuts < corpse). Geochemical surveys take soil samples to determine phosphorous content (in ppm, parts per million). A high phosphorous content may or may not indicate an
ancient burial site, food storage site, or even a garbage dump. Independent random samples from two regions gave the following phosphorous measurements (in ppm).
Assume the distribution of phosphorous is mound-shaped and symmetric for these two regions.
Region It x n, 15
857
1,551 1,230
875
1,080 2,330 1,850 1,860
2,340 1,080
910
1,130 1,450 1,260
1,010
Region III xi n 14
542 B06
1,230 1,770
790
960
1,650 860
890 640 1,180 1,160 1,050 1,020
A USE SALT
(a) Use a caiculator with mean and standard deviation keys to verify that a and s (Round your answers to four decimal places.)
ppm
ppm
ppm
ppm
(b) Let , be the population mean for x, and let be the…
Inorganic phosphorous is a naturally occurring element in all plants and animals, with concentrations increasing progressively up the food chain (fruit < vegetables < cereals < nuts < corpse). Geochemical surveys take soil samples to determine phosphorous content (in ppm, parts per million). A high phosphorous content may or may not indicate an ancient burial site, food storage site, or even a garbage dump. Independent random samples from two regions gave the following phosphorous measurements (in ppm). Assume the distribution of phosphorous is mound-shaped and symmetric for these two regions
Region I:Â x1;Â n1Â = 15
855
1550
1230
875
1080
2330
1850
1860
2340
1080
910
1130
1450
1260
1010
Region II:Â x2;Â n2Â = 14
540
810
790
1230
1770
960
1650
860
890
640
1180
1160
1050
1020
(a) Use a calculator with mean and standard deviation keys to verify that x1, s1, x2, and s2. (Round your answers to one decimal place.)
x1
=Â Â Â ppm
s1
=Â Â Â ppm
x2
=Â Â Â ppm
s2
=   ppm…
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