Question
Record No. of error/record Record No. of error/record R-5 7 R-48 2 R-9 5 R-50 3 R-23 6 R-53 5 R-30 2 R-54 1 R-32
Record
No. of error/record
Record
No. of error/record
R-5
7
R-48
2
R-9
5
R-50
3
R-23
6
R-53
5
R-30
2
R-54
1
R-32
8
R-55
6
R-38
6
R-56
1
R-39
2
R-57
3
R-40
5
R-58
4
R-45
4
R-60
8
Note 1: R-5 means record (or row) number 5. The rest of the records have no error.
Note 2: No credit if you simply report the final answer.
- Calculate mean and standard deviation. Show your complete work.
Mean: 78/18 =4.333
Standard Deviation, s: 2.2491828581535
Count, N:
18
Sum, x:
78
Mean, x:
4.3333333333333
Variance, s2:
5.0588235294118
Steps
s2 =
(xi - x)2
N - 1
=
(7 - 4.3333333333333)2 + ... + (8 - 4.3333333333333)2
18 - 1
=
86
17
=
5.0588235294118
s =
5.0588235294118
=
2.2491828581535
- What size of sample should be taken with 95% confidence if the band (margin of error) is to be 10% of sample mean in part (a)? Show your complete work with the formula.
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Concepts In Discrete Mathematics
Authors: Mofidul Islam
1st Edition
9353146372, 9789353146375
