quantitative methods

Description

Perform the following tasksin the analysis part of the research paper

a. What are the appropriate descriptive statistics to summarizethe Company-Z monthly revenue in Pre- and Post- COVID-19 ? Can you visualize both random variables separatelyusing the appropriate graphing technique?

b. What are the 95 percent confidence intervalsfor the average monthly operations cost Pre- and Post- COVID-19 ? And what do you conclude by comparing these intervals? Moreover, what is the used methodologyof constructing the confidence interval for each random variable, and why did you use the proposed methodology for each random variable?

c. Suppose there is a hypothesis arguing that the population mean of the monthly operations cost is 0.9 times the value of the average monthly operations cost during the period Pre-COVID-19 , and 1.3 times the value of the average monthly operations cost during the period Post-COVID-19 . Write thefull analytical stepsto test the two proposed hypotheses? And comment on the results?

d. What is the appropriate technique to analyse the power of the relationshipbetween the monthly revenue Pre-COVID-19 and the monthly operations cost Pre-COVID-19 ? Write the full analytical steps? And comment on the results?

What is the appropriate technique to estimate the contributionof the monthly operations cost Pre-COVID-19 to interpret the variations in the monthly revenue Pre-COVID-19 ? What do we call these two random variables in this technique? Write the full analytical steps? And comment on the results?