Student Solutions Manual for Devore's Probability and Statistics for Engineering and the Sciences, 9th
9th Edition
ISBN: 9798214004020
Author: Jay L. Devore
Publisher: Cengage Learning US
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Chapter 15.3, Problem 19E
To determine
Find the 95% confidence interval for the difference between the true average amount extracted using the first solvent and the true average amount extracted using the second solvent.
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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 < 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: x1; n1 = 15
855
1550
1230
875
1080
2330
1850
1860
2340
1080
910
1130
1450
1260
1010
Region II: x2; n2 = 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
= ppm
s1
= ppm
x2
= ppm
s2
= ppm
(b)…
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: x1; n1 = 15
855
1550
1230
875
1080
2330
1850
1860
2340
1080
910
1130
1450
1260
1010
Region II: x2; n2 = 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
= ppm
s1
= ppm
x2
= ppm
s2
= ppm…
A study measures the sorption rate of three different types of organic chemical solvents. These solvents are used to clean industrial-fabricated metal parts and
are potential hazardous waste. Independent samples of solvents from each type were tested and their sorption rates were recorded as a mole percentage.
Aromatics
Chloroalkenes
Esters
1.06
0.95
1.58
1.12
0.29
0.53
0.79
1.45
0.83
0.06
0.54
0.82
0.57
0.44
0.17
0.89
1.16
0.10
0.61
0.65
0.43
0.51
Suppose that the sampled sorption rates for the three solvents came from a decidedly non-normal population, perform the hypothesis test to determine if there
is significant differences in the sorption rates of the 3 solvents. What is the proper conclusion to this test? Choose the capital letter corresponding to your
answer.
A. The sorption rates are just the same.
B. The sorption rates are significantly different.
C. Aromatics and Esters have different sorption rates.
D. Chloroalkenes and Esters have same sorption rates.
E. None of the above
Chapter 15 Solutions
Student Solutions Manual for Devore's Probability and Statistics for Engineering and the Sciences, 9th
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Ch. 15.2 - Prob. 11ECh. 15.2 - The article A Study of Wood Stove Particulate...Ch. 15.2 - The urinary fluoride concentration (parts per...Ch. 15.2 - Prob. 14ECh. 15.2 - The article Measuring the Exposure of Infants to...Ch. 15.2 - Prob. 16ECh. 15.3 - Prob. 17ECh. 15.3 - Compute the 99% signed-rank interval for true...Ch. 15.3 - Prob. 19ECh. 15.3 - Prob. 20ECh. 15.3 - Prob. 21ECh. 15.3 - Compute a 99% CI for 1 2 using the data in...Ch. 15.4 - The accompanying data refers to concentration of...Ch. 15.4 - Prob. 24ECh. 15.4 - Prob. 25ECh. 15.4 - Prob. 26ECh. 15.4 - In an experiment to study the way in which...Ch. 15 - The article Effects of a Rice-Rich Versus...Ch. 15 - Prob. 29SECh. 15 - The given data on phosphorus concentration in...Ch. 15 - Prob. 31SECh. 15 - Prob. 32SECh. 15 - The sign test is a very simple procedure for...Ch. 15 - Prob. 34SECh. 15 - Prob. 35SECh. 15 - Prob. 36SE
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