CE 200L Report 5
CE 200L Report 5
CE 200L Report 5
Long Beach
CE 200L
Short-Form Lab Report
Report No: 5
Please staple this cover sheet to the report in the designated place at the upper left corner only.
Please do not use a folder.
CE 200L
Report No 5
c) To become familiar with the fundamentals of statistical method used in quality control
2. References
CE 200 Student Notes and Workbook (Pages 19 – 27) and the references cited on Page 19 of
said workbook
3. Procedure
The above-listed references were read, and the instructions given during the briefing period
were followed.
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b) Concrete Field and Laboratory Data
f ′c Frequency
2,700 4
2,800 4
2,900 5
3,000 6
3,100 9
3,200 20
3,300 37
3,400 20
3,500 10
3,600 4
n 119
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b) Mean Value
n = 119 Σ = 385,900
n =119 =
3,242.86 psi
c) Median Value
Median n=119 = 3,300 psi, corresponding to the value of specimen # 60
d) Standard Deviation
Class Deviation Frqncy.
Deviation Frequency ×
Interval from the (of
Squared Deviation Squared
Mid-Point Mean Occrnce.)
(xi) (xi – ) (xi – )2 (f) (f(xi – )2)
2,700 -543 294,850 4 1,179,400
2,800 -443 196,250 4 785,00
2,900 -343 117,650 5 588,250
3,000 -243 59,050 6 354,300
3,100 -143 20,450 9 184,050
3,200 -43 1,850 20 37,000
3,250 120,250
3,300 57 37
24,650 493,000
3,400 157 20
66,050 660,500
3,500 257 127,450 10 509,800
3,600 357 4
n= 119 Σ = 4,911,550
=
Variance ⇒ 119
= 41,273.5
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σ = 203.16 psi
f) Coefficient of Variation
CV =
σ =
6.26 %
g) Conclusion
For conclusions, using Standard American English and complete
sessment on:
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between 5-15%, anything with a variance above 15%
sistent results.
ferior ones.
is being analyzed.
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