EBK STATISTICS FOR BUSINESS & ECONOMICS
12th Edition
ISBN: 9780100460461
Author: Anderson
Publisher: YUZU
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Textbook Question
Chapter 11, Problem 34SE
Two new assembly methods are tested and the variances in assembly times are reported. Use α = .10 and test for equality of the two population variances.
| Method A | Method B | |
| n1 = 31 | n2 = 25 | |
| Sample Variation |
|
|
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Compute the relative risk of falling for the two groups (did not stop walking vs. did stop). State/interpret your result verbally.
Microsoft Excel include formulas
Question 1
The data shown in Table 1 are and R values for 24 samples of size n = 5 taken from a process producing
bearings. The measurements are made on the inside diameter of the bearing, with only the last three decimals
recorded (i.e., 34.5 should be 0.50345).
Table 1: Bearing Diameter Data
Sample Number
I
R
Sample Number
I R
1
34.5
3
13
35.4
8
2
34.2
4
14
34.0
6
3
31.6
4
15
37.1
5
4
31.5
4
16
34.9
7
5
35.0
5
17
33.5
4
6
34.1
6
18
31.7
3
7
32.6
4
19
34.0
8
8
33.8
3
20
35.1
9
34.8
7
21
33.7
2
10
33.6
8
22
32.8
1
11
31.9
3
23
33.5
3
12
38.6 9
24
34.2
2
(a) Set up and R charts on this process. Does the process seem to be in statistical control? If necessary,
revise the trial control limits. [15 pts]
(b) If specifications on this diameter are 0.5030±0.0010, find the percentage of nonconforming bearings pro-
duced by this process. Assume that diameter is normally distributed. [10 pts]
1
Chapter 11 Solutions
EBK STATISTICS FOR BUSINESS & ECONOMICS
Ch. 11.1 - Find the following chi-square distribution values...Ch. 11.1 - A sample of 20 items provides a sample standard...Ch. 11.1 - A sample of 16 items provides a sample standard...Ch. 11.1 - The variance in drug weights is critical in the...Ch. 11.1 - John Calipari, head basketball coach for the 2012...Ch. 11.1 - Americans spend nearly 7 billion on Halloween...Ch. 11.1 - To analyze the risk, or volatility, associated...Ch. 11.1 - Prob. 8ECh. 11.1 - An automotive part must be machined to close...Ch. 11.1 - Consumer Reports uses a 100-point customer...
Ch. 11.1 - At the end of 2008, the variance in the semiannual...Ch. 11.1 - A Fortune study found that the variance in the...Ch. 11.2 - Find the following F distribution values from...Ch. 11.2 - A sample of 16 items from population 1 has a...Ch. 11.2 - Consider the following hypothesis test....Ch. 11.2 - Investors commonly use the standard deviation of...Ch. 11.2 - Most individuals are aware of the fact that the...Ch. 11.2 - Data were collected on the top 1000 financial...Ch. 11.2 - The variance in a production process is an...Ch. 11.2 - On the basis of data provided by a Romac salary...Ch. 11.2 - Many smartphones, especially those of the...Ch. 11.2 - A research hypothesis is that the variance of...Ch. 11 - Because of staffing decisions, managers of the...Ch. 11 - Initial public offerings (IPOs) of stocks are on...Ch. 11 - The estimated daily living costs for an executive...Ch. 11 - Part variability is critical in the manufacturing...Ch. 11 - The filling variance for boxes of cereal is...Ch. 11 - City Trucking, Inc., claims consistent delivery...Ch. 11 - A sample of 9 days over the past six months showed...Ch. 11 - A sample standard deviation for the number of...Ch. 11 - Is there any difference in the variability in golf...Ch. 11 - The grade point averages of 352 students who...Ch. 11 - The accounting department analyzes the variance of...Ch. 11 - Two new assembly methods are tested and the...
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