Entreprise no	Nombre de commandes par mois	Achat par voie lectronique
1	4	Oui
2	3	Non
3	4	Non
4	5	Oui
5	4	Non
6	4	Non
7	3	Oui
8	5	Oui
9	4	Oui
10	4	Non
11	5	Oui
12	4	Non
13	4	Oui
14	4	Non
15	5	Oui
16	4	Oui
17	4	Non
18	4	Oui
19	4	Non
20	4	Non
21	4	Non
22	5	Oui
23	4	Non
24	4	Non
25	5	Non
26	4	Non
27	4	Non
28	4	Oui
29	5	Oui
30	4	Non
31	4	Oui
32	4	Non
33	4	Non
34	5	Oui
35	5	Non
36	4	Non
37	5	Oui
38	4	Non
39	4	Non
40	5	Oui
41	4	Non
42	4	Oui
43	4	Oui
44	4	Oui
45	4	Oui
46	5	Oui
47	5	Oui
48	4	Non
49	3	Oui
50	5	Oui

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? %