Question
State whether the following statements are True or False. Give reason in support of your answer:
(i) The c-chart is suitable for moniterting to proportion of defective.
(ii) In single sampling plan, if we increase acceptance number then the OC curve will be steeper.
(iii) Autocorrelation measures the relationship between yt and yt-k after removing the effect of intermediate lags.
(iv) If the effect of summer and winter is not constant on the sale of AC then we use the additive model of the time series.
(v) In a series system, improving the reliability of the weakest component gives the maximum improvement in system reliability.
Answer :
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(i) False. A c-chart is used to monitor the number of defects per unit when the sample size is constant, not the proportion of defective items. The proportion of defectives is monitored using a p-chart. (ii) False. In a single sampling plan, increasing the acceptance number makes the OC
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