Q.2 The average compressive strength of concrete paving blocks produced at ABC Company is measured by testing three blocks from each batch of production. The test results for 15 consecutive samples are given below. Sample Compressive strength (N/mm?) no. Block-1 Block-2 Block-3 1 33.45 28.25 30.05 2 22.52 26.14 28.46 3 29.10 29.87 34.16 4 25.36 28.21 30.69 31.65 34.10 34.80 29.11 32.54 27.55 7 34.23 24.19 30.63 29.84 8.36 30.45 30.25 34.26 33.18 10 29.25 33.56 33.12 11 29.56 32.82 32.02 12 30.16 32.77 30.50 13 26.35 29.44 36.52 14 31.58 27.19 30.20 15 26.48 30.48 28.64 a) Develop 'mean' and 'range' charts for three-sigma quality control. b) Comment about the status of the process.
Q.2 The average compressive strength of concrete paving blocks produced at ABC Company is measured by testing three blocks from each batch of production. The test results for 15 consecutive samples are given below. Sample Compressive strength (N/mm?) no. Block-1 Block-2 Block-3 1 33.45 28.25 30.05 2 22.52 26.14 28.46 3 29.10 29.87 34.16 4 25.36 28.21 30.69 31.65 34.10 34.80 29.11 32.54 27.55 7 34.23 24.19 30.63 29.84 8.36 30.45 30.25 34.26 33.18 10 29.25 33.56 33.12 11 29.56 32.82 32.02 12 30.16 32.77 30.50 13 26.35 29.44 36.52 14 31.58 27.19 30.20 15 26.48 30.48 28.64 a) Develop 'mean' and 'range' charts for three-sigma quality control. b) Comment about the status of the process.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
Related questions
Question
The average compressive strength of concrete paving blocks produced at ABC Company is measured by testing three blocks from each batch of production. The test results for 15 consecutive samples are given below.
a) Develop ‘mean’ and ‘range’ charts for three-sigma quality control.
b) Comment about the status of the process.
![Q.2
The average compressive strength of concrete paving blocks produced at ABC Company
is measured by testing three blocks from each batch of production. The test results for 15
consecutive samples are given below.
Sample Compressive strength (N/mm?)
no.
Block-1
Block-2
Block-3
1
33.45
28.25
30.05
22.52
26.14
28.46
3
29.10
29.87
34.16
4
25.36
28.21
30.69
5
31.65
34.10
34.80
6.
29.11
32.54
27.55
7
34.23
24.19
30.63
8
29.84
28.36
30.45
9.
30.25
34.26
33.18
10
29.25
33.56
33.12
11
29.56
32.82
32.02
12
30.16
32.77
30.50
13
26.35
29.44
36.52
14
31.58
27.19
30.20
15
26.48
30.48
28.64
a) Develop 'mean' and 'range' charts for three-sigma quality control.
b) Comment about the status of the process.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F18f2e144-fa47-49d2-9503-e72c027fd315%2F3a893c24-6693-44dd-9c5f-74087d7915cb%2Fe5j77ff_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Q.2
The average compressive strength of concrete paving blocks produced at ABC Company
is measured by testing three blocks from each batch of production. The test results for 15
consecutive samples are given below.
Sample Compressive strength (N/mm?)
no.
Block-1
Block-2
Block-3
1
33.45
28.25
30.05
22.52
26.14
28.46
3
29.10
29.87
34.16
4
25.36
28.21
30.69
5
31.65
34.10
34.80
6.
29.11
32.54
27.55
7
34.23
24.19
30.63
8
29.84
28.36
30.45
9.
30.25
34.26
33.18
10
29.25
33.56
33.12
11
29.56
32.82
32.02
12
30.16
32.77
30.50
13
26.35
29.44
36.52
14
31.58
27.19
30.20
15
26.48
30.48
28.64
a) Develop 'mean' and 'range' charts for three-sigma quality control.
b) Comment about the status of the process.
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