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1. Calculate the average daily inventory holdingcost during Pre- and Post- COVID-19X1& X2? Explainwhether this average is considered as population parametersor sample statistics? Justify your answer?                             [15 marks]
2. What is the 95 percent confidence intervalsfor the average daily inventory holding cost Pre- and Post-COVID-19 X1&X2? And what do you conclude by comparingthese intervals? Also what is the 99 percentconfidence interval for the average daily inventoryholding cost Post- COVID-19 X2? Andwhat do you conclude by comparing the 95 and 99 percentconfidence intervals for the average daily inventoryholding cost Post- COVID-19 X2?                                                               [15Marks]
3. Suppose there is a hypothesis arguing that the population meanof the daily inventory holding cost is 1.5 times the value ofaverage daily inventory holding cost during the selected period(November and December 2019) Pre-COVID-19X1. List the full analyticalsteps to test this hypothesis? Comment on theresult and write your conclusion regarding thehypothesis?            [15marks]
4. To what extent is there a change in the pattern or thepower of the relationship Pre- and Post- COVID-19between the daily inventory holding cost X and the dailysales Y? Support your answer with the appropriatestatisticalevidences.                                                                             [15 marks]

Discuss the appropriate statistical technique that can explainthe variation in the daily sales because of the daily inventoryholding cost Post-COVID-19 post COVID 19. Justify youranswer.