Question

To raise awareness of its capabilities, FedEx developed a sales promotion that was sent to selected...

To raise awareness of its capabilities, FedEx developed a sales promotion that was sent to selected offices. To assess the possible benefit of the promotion, FedEx pulled the shipping records for a random sample of 50 offices that received the promotion and another random sample of 75 that did not and collected data on the number of mailings. They want to see if those who received the sales promotions shipped more mailings. The complete set of results is provided below:

State the null hypotheses.

Run the test. Paste the test output, and state your decision.

c. What is the best estimate for the population difference in means for the number of mailings between offices with the promotion and offices without the promotion? (Be 90% confident in your estimate).

d. Interpret the confidence interval in part c.

e. What is the margin of error associated with 90% confidence interval?

The complete set of results is provided below:

Promotion Mailings

Promotions_NO 15

Promotions_NO 49

Promotions_NO 42

Promotions_NO 12

Promotions_NO 26

Promotions_NO 35

Promotions_NO 38

Promotions_NO 13

Promotions_NO 35

Promotions_NO 14

Promotions_NO 0

Promotions_NO 64

Promotions_NO 27

Promotions_NO 63

Promotions_NO 50

Promotions_NO 43

Promotions_NO 32

Promotions_NO 39

Promotions_NO 13

Promotions_NO 19

Promotions_NO 47

Promotions_NO 48

Promotions_NO 38

Promotions_NO 59

Promotions_NO 35

Promotions_NO 8

Promotions_NO 10

Promotions_NO 58

Promotions_NO 44

Promotions_NO 9

Promotions_NO 10

Promotions_NO 0

Promotions_NO 42

Promotions_NO 37

Promotions_NO 23

Promotions_NO 12

Promotions_NO 54

Promotions_NO 41

Promotions_NO 40

Promotions_NO 43

Promotions_NO 45

Promotions_NO 18

Promotions_NO 65

Promotions_NO 10

Promotions_NO 17

Promotions_NO 59

Promotions_NO 26

Promotions_NO 18

Promotions_NO 5

Promotions_NO 14

Promotions_NO 77

Promotions_NO 29

Promotions_NO 60

Promotions_NO 19

Promotions_NO 30

Promotions_NO 29

Promotions_NO 12

Promotions_NO 0

Promotions_NO 20

Promotions_NO 31

Promotions_NO 13

Promotions_NO 5

Promotions_NO 7

Promotions_NO 42

Promotions_NO 36

Promotions_NO 9

Promotions_NO 23

Promotions_NO 70

Promotions_NO 28

Promotions_NO 25

Promotions_NO 26

Promotions_NO 24

Promotions_NO 50

Promotions_NO 7

Promotions_NO 0

Promotions_YES 38

Promotions_YES 74

Promotions_YES 18

Promotions_YES 65

Promotions_YES 60

Promotions_YES 51

Promotions_YES 71

Promotions_YES 47

Promotions_YES 29

Promotions_YES 39

Promotions_YES 38

Promotions_YES 36

Promotions_YES 57

Promotions_YES 36

Promotions_YES 0

Promotions_YES 20

Promotions_YES 23

Promotions_YES 79

Promotions_YES 16

Promotions_YES 4

Promotions_YES 62

Promotions_YES 37

Promotions_YES 2

Promotions_YES 23

Promotions_YES 6

Promotions_YES 0

Promotions_YES 28

Promotions_YES 65

Promotions_YES 25

Promotions_YES 86

Promotions_YES 27

Promotions_YES 58

Promotions_YES 33

Promotions_YES 54

Promotions_YES 40

Promotions_YES 92

Promotions_YES 71

Promotions_YES 0

Promotions_YES 77

Promotions_YES 60

Promotions_YES 56

Promotions_YES 38

Promotions_YES 16

Promotions_YES 89

Promotions_YES 62

Promotions_YES 9

Promotions_YES 42

Promotions_YES 73

Promotions_YES 49

Promotions_YES 14

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