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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Textbook Question
Chapter 9.5, Problem 64E
The following observations are on time (h) for a AA 1.5- volt alkaline battery to reach a 0.8 voltage (“Comparingthe Lifetimes of Two Brands of Batteries,” J. of Statistical Educ., 2013, online):
| Energizer: | 8.65 | 8.74 | 8.91 | 8.72 | 8.85 |
| Ultracell: | 8.76 | 8.81 | 8.81 | 8.70 | 8.73 |
| Energizer: | 8.52 | 8.62 | 8.68 | 8.86 | |
| Ultracell: | 8.76 | 8.68 | 8.64 | 8.79 |
Normal probability plots support the assumption that the population distributions are normal. Does the data suggest that the variance of the Energizer population distribution differs from that of the Ultracell population distribution? Test the relevant hypotheses using a significance level of .05. [Note: The two-sample t test for equality of population means gives a P-value of .763.] The Energizer batteries are much more expensive than the Ultracell batteries. Would you pay the extra money?
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Question 1/18
Sal's Orange Stand made a table that shows a relationship between the total number of oranges and the number of
boxes they sell. Each box has the same number of oranges. Sal made an error in one of the rows.
1
Sal's Orange Stand
Number of
Row Number
Number of Boxes
Oranges
1
13
2
65
91
7
4.
130
10
156
12
Part A
Which row contains Sal's error? Enter the row number in the first response box.
Unfortunately, arsenic occurs naturally in some ground water.t A mean arsenic level of u = 8.0 parts per billion (ppb) is considered safe for agricultural use. A well in Texas is used to water cotton crops.
This well is tested on a regular basis for arsenic. A random sample of 36 tests gave a sample mean of x = 6.7 ppb arsenic, with s = 3.0 ppb. Does this information indicate that the mean level of arsenic
in this well is less than 8 ppb? Use a = 0.01.
n USE SALT
(a) What is the level of significance?
State the null and alternate hypotheses.
O Ho: H = 8 ppb; H,: u > 8 ppb
O Ho: H = 8 ppb; H,: H + 8 ppb
O Ho: H 8 ppb; H,: u = 8 ppb
O Ho: H = 8 ppb; H,: µ 0.100
O 0.050 < P-value < 0.100
O 0.010 < P-value < 0.050
O 0.005 < P-value < 0.010
P-value < 0.005
Sketch the sampling distribution and show the area corresponding to the P-value.
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Chapter 9 Solutions
Student Solutions Manual for Devore's Probability and Statistics for Engineering and the Sciences, 9th
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