According to the customer service magazine we have the following data: the average number of orders per month for office products would be four for this type of business and 45% of its businesses prefer to place their orders electronically We conduct a survey of 50 companies in the Quebec region

A) test at the significance level a=0.05 The statement concerning the average number of orders per month specify the hypotheses that we want to test here - [ ]

B) Determine a 95% confidence interval for the average number of orders per month. Can we say using this interval that it is likely that the average number of orders per month is 4? discuss - [ ]

C) Can we consider at threshold a=0.01 that the percentage of companies preferring to place their orders electronically is greater than 45% - [ ]

D) Assuming that the total number of businesses in the Quebec region is 150, can we consider at threshold a=0.01 that the percentage of businesses preferring to place their orders electronically is greater than 45? %