(Y1 ) is the Company-Z daily sales along the period Pre-COVID-19 (November and December 2019); (Y2) is the same Company-Z daily sales but during the period Post-COVID-19 (April and May 2020); (X1 ) is the daily inventory holding cost during the period Pre-COVID-19 (November and December 2019); while (X2 ) is the same daily inventory holding cost but during the period Post-COVID-19 (April and May 2020). Accordingly, in your analysis, you will depend on two main random variables over two time series. The first random variable is the Company-Z daily sales, and the second random variable is the Company-Z daily inventory holding cost. Therefore, the two random variables will be chosen over two periods of time: the first is (Pre-COVID-19: November and December 2019), and the second is (Post-COVID-19: April and May 2020). Your task is to prepare comprehensive report to the company, fulfilling specific requirements outlined below in point.

QUESTION 5:

To what extent is there a change in the pattern or the power of the relationship Pre- and Post- COVID-19 between the daily inventory holding cost (X) and the daily sales (Y)? Support your answer with the appropriate statistical evidences. [15 marks]

QUESTION 6; Discuss the appropriate statistical technique that can explain the variation in the daily sales because of the daily inventory holding cost Post-COVID-19 post COVID 19. Justify your answer.[15 marks]