1.40 In a ready-mix plant, cylindrical samples are prepared and tested periodically to detect any mix problem and to ensure that the compressive strength is higher than the lower specification limit. The minimum target value was set at 5,000 psi. The following compressive strength data were collected. Sample No. Compressive Strength (psi) Compressive Strength (psi) Sample No. 1 5595 11 6695 5139 12 5449 3 6359 13 5278 4 5192 14 6697 5188 15 5195 6. 5241 16 6021 7 5964 17 5320 8 5875 18 5657 6155 19 6595 10 5115 20 5235 a. Calculate the mean, standard deviation, and the coefficient of variation of the data. b. Using a spreadsheet program, create a control chart for these data showing the target value and the lower specification limit. Is the plant production meeting the specification requirement? If not, comment on possible rea- sons. Comment on the data scatter.
1.40 In a ready-mix plant, cylindrical samples are prepared and tested periodically to detect any mix problem and to ensure that the compressive strength is higher than the lower specification limit. The minimum target value was set at 5,000 psi. The following compressive strength data were collected. Sample No. Compressive Strength (psi) Compressive Strength (psi) Sample No. 1 5595 11 6695 5139 12 5449 3 6359 13 5278 4 5192 14 6697 5188 15 5195 6. 5241 16 6021 7 5964 17 5320 8 5875 18 5657 6155 19 6595 10 5115 20 5235 a. Calculate the mean, standard deviation, and the coefficient of variation of the data. b. Using a spreadsheet program, create a control chart for these data showing the target value and the lower specification limit. Is the plant production meeting the specification requirement? If not, comment on possible rea- sons. Comment on the data scatter.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:1.40 In a ready-mix plant, cylindrical samples are prepared and tested periodically
to detect any mix problem and to ensure that the compressive strength is
higher than the lower specification limit. The minimum target value was set
at 5,000 psi. The following compressive strength data were collected.
Compressive
Strength (psi)
Compressive
Strength (psi)
Sample No.
Sample No.
1
5595
11
6695
2
5139
12
5449
6359
13
5278
4
5192
14
6697
5
5188
15
5195
6.
5241
16
6021
7
5964
17
5320
5875
18
5657
6155
19
6595
10
5115
20
5235
a. Calculate the mean, standard deviation, and the coefficient of variation
of the data.
b. Using a spreadsheet program, create a control chart for these data showing
the target value and the lower specification limit. Is the plant production
meeting the specification requirement? If not, comment on possible rea-
sons. Comment on the data scatter.
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