Question
A quality control engineer of a watch manufacturing company has the task of monitoring whether the...
A quality control engineer of a watch manufacturing company has the task of monitoring whether the diameters of the watch faces meet the specifications. The diameters of the watch faces are known to be normally distributed, with mean 35.8mm and standard deviation 0.05mm. A sample of 150 watch faces is produced. Compute the following:
(a) the lower limit of a 90% confidence interval; [4]
(b) the upper limit of a 90% confidence interval; [2]
(c) the lower limit of a 95% confidence interval; [3]
(d) the upper limit of a 95% confidence interval; [1]
(e) the lower limit of a 99% confidence interval; [3]
(f ) the upper limit of a 99% confidence interval. [1]
Round your answers to four decimal places.
Homework Answers
Answer #1
Not the answer you're looking for?
Similar Questions
The quality control manager at a light bulb factory needs to estimate the mean life of...
The quality control manager at a light bulb factory needs to
estimate the mean life of a large shipment of light bulbs. The
standard deviation is 91 hours. A random sample of 49 light bulbs
indicated a sample mean life of 290 hours. Complete parts (a)
through (d) below.
A. Construct a 99% confidence interval estimate for the
population mean life of light bulbs in this shipment. The 99%
confidence interval estimate is from a lower limit of [ ]...
The following are quality control data for a manufacturing process at Kensport Chemical Company. The data...
The following are quality control data for a manufacturing
process at Kensport Chemical Company. The data show the temperature
in degrees centigrade at five points in time during a manufacturing
cycle.
Sample
x
R
1
95.72
1.0
2
95.24
0.9
3
95.18
0.7
4
95.42
0.4
5
95.46
0.5
6
95.32
1.1
7
95.40
0.9
8
95.44
0.3
9
95.08
0.2
10
95.50
0.6
11
95.80
0.6
12
95.22
0.2
13
95.60
1.3
14
95.22
0.6
15
95.04
0.8
16...
The following are quality control data for a manufacturing process at Kensport Chemical Company. The data...
The following are quality control data for a manufacturing
process at Kensport Chemical Company. The data show the temperature
in degrees centigrade at five points in time during a manufacturing
cycle.
Sample
x
R
1
95.72
1.0
2
95.24
0.9
3
95.18
0.7
4
95.44
0.4
5
95.46
0.5
6
95.32
1.1
7
95.40
0.9
8
95.44
0.3
9
95.08
0.2
10
95.50
0.6
11
95.80
0.6
12
95.22
0.2
13
95.54
1.3
14
95.22
0.6
15
95.04
0.8
16...
The following are quality control data for a manufacturing process at Kensport Chemical Company. The data...
The following are quality control data for a manufacturing
process at Kensport Chemical Company. The data show the temperature
in degrees centigrade at five points in time during a manufacturing
cycle.
Sample
x
R
1
95.72
1.0
2
95.24
0.9
3
95.18
0.7
4
95.42
0.4
5
95.46
0.5
6
95.32
1.1
7
95.40
0.9
8
95.44
0.3
9
95.08
0.2
10
95.50
0.6
11
95.80
0.6
12
95.22
0.2
13
95.58
1.3
14
95.22
0.6
15
95.04
0.8
16...
The quality control manager at a light bulb factory needs to estimate the mean life of...
The quality control manager at a light bulb factory needs to
estimate the mean life of a large shipment of light bulbs. The
standard deviation is 98 hours. A random sample of 49 light bulbs
indicated a sample mean life of 300 hours.
(a) Construct a 99% confidence interval estimate for the
population mean life of light bulbs in this shipment.
(Ans.) The 99% confidence interval estimate is from a lower
limit of 263.9 hours to an upper limit of...
In one manufacturing company, it is known the probability of a product pass the quality control...
In one manufacturing company, it is known the probability of a
product pass the quality control test can only be 0.6, 0.2 or 0.1,
otherwise they are identified as defective. Considering occurrence
chance of 0.6 scenario is twice higher than the other
possibilities, if quality control center test products, what is the
probability that until a defective item has been found: is 0.6, 0.2
or 0.1 given they had to test 1, 2, 3, or 4 products?
The following are quality control data for a manufacturing process at Kensport Chemical Company. The data...
The following are quality control data for a manufacturing
process at Kensport Chemical Company. The data show the temperature
in degrees centigrade at five points in time during a manufacturing
cycle.
Sample
x
R
1
95.72
1.0
2
95.24
0.9
3
95.18
0.7
4
95.46
0.4
5
95.46
0.5
6
95.32
1.1
7
95.40
1.0
8
95.44
0.3
9
95.08
0.2
10
95.50
0.6
11
95.80
0.6
12
95.22
0.2
13
95.60
1.3
14
95.22
0.5
15
95.04
0.8
16...
The following are quality control data for a manufacturing process at Kensport Chemical Company. The data...
The following are quality control data for a manufacturing
process at Kensport Chemical Company. The data show the temperature
in degrees centigrade at five points in time during a manufacturing
cycle.
Sample
x
R
1
95.72
1.0
2
95.24
0.9
3
95.18
0.7
4
95.42
0.4
5
95.46
0.5
6
95.32
1.1
7
95.40
1.0
8
95.44
0.3
9
95.08
0.2
10
95.50
0.6
11
95.80
0.6
12
95.22
0.2
13
95.54
1.3
14
95.22
0.5
15
95.04
0.8
16...
A manufacturing company makes runners for cabinet drawers. To assess the quality of the manufacturing process,...
A manufacturing company makes runners for cabinet drawers. To
assess the quality of the manufacturing process, the company
collected one sample of 300 consecutively manufactured runners each
day for 20 days and counted the number of defective items. The
resulting sample data are:
Sample: 1 2 3 4 5 6 7 8 9
10
Sample Size: 300 300 300 300 300 300 300 300 300
300
Defectives: 8 6
11 15 12
11 9 6 5 4
The Upper Control Limit, UCL, for a p control chart based on the
above data is
Bongo’s nut bar is produced at a highly automated facility. One of the quality control factors is...
Bongo’s nut bar is produced at a highly automated
facility. One of the quality control factors is the
weight of each bar. Samples of 10 bars are taken
regularly and adjustments are made based on the outcome of quality
control process. Average weights and ranges of the
latest samples are reported as following:
Sample
Average
weight
(gram)
Range
1
51
5
2
53
4
3
48
1
4
49
3
5
52
2
What is the upper control limit of X chart?
50.5...
ADVERTISEMENT
Need Online Homework Help?
Get Answers For Free
Most questions answered within 1 hours.
ADVERTISEMENT
Active Questions
asked 6 minutes ago
asked 16 minutes ago
asked 24 minutes ago
asked 35 minutes ago
asked 49 minutes ago
asked 49 minutes ago
asked 49 minutes ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago