STATISTICS FOR ENGR.+SCI-W/ACCESS
4th Edition
ISBN: 9781260036107
Author: Navidi
Publisher: MCG
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Textbook Question
Chapter 10, Problem 7SE
To set up a p chart to monitor a process that produces computer chips, samples of 300 chips are taken daily, and the number of defective chips in each sample is counted. The numbers of defective chips for each of the last 20 days are as follows:
| 12 | 13 | 11 | 10 | 15 | 9 | 1 | 10 | 9 | 15 |
| 8 | 13 | 11 | 9 | 16 | 12 | 19 | 20 | 18 | 9 |
- a. Compute the upper and lower 3σ limits for a p chart.
- b. At which sample is the process first detected to be out of control?
- c. Suppose that the special cause that resulted in the out-of-control condition is determined. Should this cause be remedied? Explain.
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To set up a p chart to monitor a process that produces computer chips, samples of 300 chips are taken daily, and the number of defective chips in each sample is counted. The numbers of defective chips for each of the last 20 days are as follows: 1213111015 9 1 10 9 15 8 1311 9 1612192018 9 a) Compute the upper and lower 3σ limits for a p chart. b) At which sample is the process first detected to be out of control? c) Suppose that the special cause that resulted in the out-of-control condition is determined. Should this cause be remedied? Explain.
A manufacturer of “Keep It Warm” bags is interested in comparing the heat retention of bags when used at five different temperatures (100°F, 125°F, 150°F, 175°F, and 200°F). Thirty bags are selected randomly from last week’s production and randomly assigned, six each, to five different groups. Items from group 1 at beginning temperature 100°F were kept in bags for an hour, and the temperatures of those items were recorded after an hour. Similarly, groups 2 to 5 were assigned items at 125°F, 150°F, 175°F, and 200°F, respectively.
Identify the type of study used here.
What type of inference is possible from this study?
In an experiment to determine the effect of ambient temperature on the emissons of oxides of nitrogen (
NOx
) of diesel trucks,
10
trucks were run at temperatures of
40°F
and
80°F
. The emissions, in parts per billion, are presented in the following table.
Truck
40°F
80°F
1
926.5
896.7
2
851.1
857.0
3
975.5
952.1
4
1009.3
884.8
5
871.8
840.7
6
949.2
885.1
7
1006.3
885.5
8
836.5
777.8
9
837.8
850.2
10
958.9
882.1
Send data to Excel
Let
μ1
represent the mean emission at
40°F
and
=μd−μ1μ2
.Can you conclude that the mean emission differs between the two temperatures? Use the
=α0.05
level of significance and the TI-84 Plus calculator to answer the following.
p value ?
do we reject?
is there enough evidence :?
Chapter 10 Solutions
STATISTICS FOR ENGR.+SCI-W/ACCESS
Ch. 10.1 - Indicate whether each of the following quality...Ch. 10.1 - True or false: a. Control charts are used to...Ch. 10.1 - Prob. 3ECh. 10.1 - Prob. 4ECh. 10.1 - True or false: a. When a process is in a stale of...Ch. 10.1 - Prob. 6ECh. 10.2 - The quality-control plan for a certain production...Ch. 10.2 - The following X chart depicts the last 50 samples...Ch. 10.2 - The thickness, in mm, of metal washers is measured...Ch. 10.2 - Repeat Exercise 3, using the S chart in place of...
Ch. 10.2 - A process has mean 12 and standard deviation 3....Ch. 10.2 - A process has mean 8 and standard deviation 2. The...Ch. 10.2 - A process is monitored by taking samples at...Ch. 10.2 - Prob. 8ECh. 10.2 - Repeat Exercise 8, using the S chart in place of...Ch. 10.2 - Prob. 10ECh. 10.2 - Repeat Exercise 10, using the S chart in place of...Ch. 10.2 - Copper wires are coated with a thin plastic...Ch. 10.2 - Repeat Exercise 12, using the S chart in place of...Ch. 10.3 - Prob. 1ECh. 10.3 - The target fill weight for a box of cereal is 350...Ch. 10.3 - Prob. 3ECh. 10.3 - Refer to Exercise 3. In the last 50 samples, there...Ch. 10.3 - A newly designed quality-control program for a...Ch. 10.3 - Prob. 6ECh. 10.3 - Prob. 7ECh. 10.3 - Each hour, a 10 m2 section of fabric is inspected...Ch. 10.4 - Refer to Exercise 3 in Section 10.2. a. Delete any...Ch. 10.4 - Refer to Exercise 8 in Section 10.2. a. Delete any...Ch. 10.4 - Prob. 3ECh. 10.4 - Refer to Exercise 12 in Section 10.2.ss a. Delete...Ch. 10.4 - Prob. 5ECh. 10.4 - Prob. 6ECh. 10.5 - The thickness specification for aluminum sheets is...Ch. 10.5 - The specification for the diameters of ball...Ch. 10.5 - Refer to Exercise 2. a. To what value should the...Ch. 10.5 - Refer to Exercise 1. a. To what value should the...Ch. 10.5 - A process has a process capability index of Cp =...Ch. 10 - Prob. 1SECh. 10 - Prob. 2SECh. 10 - Prob. 3SECh. 10 - Prob. 4SECh. 10 - Prob. 5SECh. 10 - Prob. 6SECh. 10 - To set up a p chart to monitor a process that...
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