13. Analysis
a) Result Do not Reject H0 Do not Reject H0 Reject H0 Do not Reject H0
b) std. dev. 0.22 0.22 0.21 0.21
M.E. 0.11 0.11 0.11 0.11
Upper limit =
sample mean + 12.07 12.14 12.00 12.19
M.E.
Lower limit =
sample mean - 11.85 11.92 11.78 11.97
M.E.
c) Interval Do not Reject H0: Do not Reject H0: Do not Reject H0: Do not Reject H0:
Estimate within Limit within Limit within Limit within Limit
d) Changing α
Sarjeevan Sainbhi 13
14. Conclusion
• More samples are required in order to determine
variability in the process.
• The samples can be collected at different time &
days of operation to monitor the process
effectively.
• The sample standard deviation varies within the
sample.
• As all the Same Mean are within limited thus No
corrective action is required.
• As the value of α is changed to larger value, the P
value reduces leading to rejection of Null
hypothesis.
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