Estimate the standard deviation of the process:
Draw the X (bar) and R charts for the data given and give your comments about the process under study. Estimate the standard deviation of the process.
|
Sample No.
|
Individual Measurement
|
|
1.
|
72
|
70
|
-70
|
64
|
|
2.
|
70
|
68
|
67
|
65
|
|
3.
|
68
|
66
|
65
|
62
|
|
4.
|
69
|
70
|
67
|
68
|
|
5.
|
70
|
68
|
68
|
66
|
|
6.
|
68
|
67
|
70
|
69
|
|
7.
|
68
|
60
|
66
|
61
|
|
8.
|
72
|
71
|
66
|
67
|
|
9.
|
70
|
69
|
69
|
66
|
|
10.
|
66
|
68
|
67
|
66
|
|
11.
|
72
|
73
|
67
|
64
|
|
12.
|
72
|
68
|
67
|
65
|
|
13.
|
70
|
67
|
69
|
63
|
|
14.
|
70
|
64
|
68
|
72
|
|
15.
|
74
|
70
|
67
|
68
|
Ques: Differentiate between :
i) Parameter and Statistics
ii) Target Population and Sampled Population
iii) Stratified Random Sampling and Cluster Sampling
iv) Multistage Sampling and Multiphase Sampling
v) Sampling errors and Non-Sampling Errors