State whether the following statements are True or False. Give reason in support of your answer:

(i) The R-chart is suitable when subgroup size is greater than 

(ii) In single sampling plan, if we increase acceptance number then the OC curve will be steeper.

(iii) 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.

(iv) If a researcher wants to find the relationship between today's unemployment and that of 5 years ago without considering what happens in between then the partial autocorrelation is the better way in comparison to autocorrelation.

(v) A system has four components connected in parallel configuration with reliability 0.2, 0.4, 0.5, 0.8. To improve the reliability of the system most, we have to replace the component which reliability is 0.2.

(i) True
The R-chart (Range chart) is suitable when the subgroup size is small, typically up to 10. When the subgroup size is greater, the standard deviation (s-chart) is preferred as it _____ _______ ___ _________ ______ _______ _______ ___ ___ ___ _______ __________.
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