Answer Happy

Pelican Stores is a chain of women's apparel stores operating throughout the U.S. The chain recently ran a promotion in which they sent discount coupons to customers of competing clothing stores. The chain is interested in learning about the characteristics of their customers during the promotion, particularly those who use credit cards. Their goal is to construct more targeted advertising promotions in the future and to get new customers to apply for the store's own proprietary credit card. In doing this they did a survey of 100 random customers who used credit cards to make purchases during the promotion. The file PelicanStores.xls, available in the Some Datasets folder, contains the data they collected: Suppose you are a regional manager and have been asked by the chain's CEO to do some analysis of the data. In particular, he wants to know the average number of items bought by the customers that used credit cards during the promotion. Based upon previous studies, assume the population standard deviation is known to be 2.60 items. Now use the sample data in the Excel file along with your knowledge of the population standard deviation to develop a 93% confidence interval estimate for the true mean number of items bought by the customers. Report the following: The point estimate of the true average number of items bought is . (Round answer to 2 decimal places.) The standard error is items. (Round answer to 2 decimal places.) Alpha B

2 4 6 -- 8 10 12 14 : 16 The point estimate of the true average number of items bought is . (Round answer to 2 decimal places.) The standard error is A A items. (Round answer to 2 decimal places.) Alpha F N (Enter answer out to 2 decimal places.) The correct critical value is from the 93% Cl is A (enter normal or t) distribution and equals . (Round answer to 2 decimal places.) <mu < .(Round answers to 2 decimal places.) Although you entered rounded values for the intermediate steps here, do not use the rounded values to calculate the final confidence interval values. As usual, you should only round the final answer before entering it here.

Type of Customer Customer 1 2 3 4 5 6. 7 8 9 10 11 12 13 14 15 16 17 18 222222222 19 23 24 27 20 Promotional 21 Promotional Promotional Promotional Regular 25 Promotional 26 Promotional 28 29 23128 5 3 2 99 Regular Promotional Regular Promotional Regular Promotional Promotional 30 Promotional 31 Promotional 32 33 Regular Regalar Promotional Regular Promotional 34 Regular Regular Promotional Promotional Promotional Regular Promotional Promotional Regular Promotional Regular 35 Promotional Regular Promotional 39 36 Regular 37 Regular 38 Promotional Promotional 40 Regular 41 Promotional Printinnal Items 1 1 1 5 2 1 2 1 2 1 1 1 9 2 1 2 3 3 2 6 1 4 7 2- 2 1 1 5 3 1 2 1 3 1 5 1 2 6 Net Sales Method of Payment Gender 39.50 Discover 5 2 13 102.40 Proprietary Card 22.50 Proprietary Card 100,40 Proprietary Card 54.00 MasterCard 44.50 MasterCard 78.00 Proprietary Card 22.50 Visa 56.52 Proprietary Card 44.50 Proprietary Card 29,50 Proprietary Card 31.60 Proprietary Card 160.40 Visa 64.50 Visa 49.50 Visa 71.40 Proprietary Card 94.00 Proprietary Card 54.50 Discover 38.50 MasterCard 44.80 Proprietary Card 31.60 Proprietary Card 70.82 Proprietary Card 266.00 American Express 74.00 Proprietary Card 39:50 Visa 30.02 Proprietary Card 44.50 Proprietary Card 192.80 Proprietary Card 71.20 Proprietary Card 18.00 Proprietary Card 63.20 MasterCard 75.00 Proprietary Card 63.20 Proprietary Card 40.00 Proprietary Card 105.50 MasterCard 29.50 MasterCard 102.50 Visa 117.50 Proprietary Card 13.23 Proprietary Card 52.50 Proprietary Card 198.80 Proprietary Card 1040 Vi Marital Status Male Female Female Female Female Female Female Married Female Married Female Married Female Married Female Married Female Married Female Married Female Married Male Male Married Married Married Married Married Married Female Female Single Single Single Married Female Female Female Married Female Married Female Single Female Married Female Married Female Married Male Married Female Female Married Married Female Single Female Married Female Married Female Married Female Female Married Female Married Female Married Single Male Female Single Female Married Female Female Married Married Married Married Marrint Age 32 #$%£* 44 32 30 28 40 34 46 36 48 40 36 40 46 24 36 22 40 32 56 28 38 &#33RRAGIRRE 50 42 48 60 54 42 32 70 28 52 44 34 42 56 36 58 42 50 44 46

37 40 42 43 44 45 46 Promoval 72 73 74 75 76 77 78 Regular Promotional Promotional 47 Regular 48 Promotional 79 80 81 82 BA Regular Promotional Promotional Promotional 49 50 51 52 53 54 55 56 Promotional 57 Promotional 58 Promotional 59 Promotional 60 Promotional 61 Promotional 62 Promotional 63 Promotional 64 65 Promotional Promotional Promotional 66 67 Promotional 68 Promotional Promotional 69 70 Promotional 71 Promotional Promotional Promotional Promotional Regular Regular Regular Promotional Promotional Regular Promotional Promotional Promotional Regular Promotional Promotional Regular Promotional Promotional 2 13 2 3 2 3 5 I 2- 2 5 5 4 1 2 2 2 4 3 13.43 priciary Caru 52.50 Proprietary Card 198.80 Proprietary Card 19.50 Visa 123.50 Proprietary Card 62.40 Proprietary Card 23.80 Proprietary Cand 39.60 Proprietary Card 25.00 MasterCard 63.64 Proprietary Card 14.82 Proprietary Card 145.20 MasterCard 176.62 Proprietary Card 118.80 Proprietary Card 58.00 Discover 74.00 Visa 49.50 MasterCard 141.60 Proprietary Card 123.10 Proprietary Card 80.40 Proprietary Card 65.20 MasterCard 113.00 Proprietary Card 108.80 Proprietary Card 59.91 Proprietary Card 53.60 Proprietary Card 31.60 Proprietary Cand 49.50 Proprietary Card 39.60 Proprietary Card 59.50 Proprietary Card 146.80 Proprietary Card 47.20 Proprietary Card 95.05 Proprietary Card 155.32 Proprietary Card 58.00 MasterCard 69.00 Proprietary Card 46.50 Proprietary Card 45.22 Proprietary Card 84.74 Proprietary Card 39.00 Proprietary Card 111.14 Proprietary Card 86.80 Proprietary Card 89.00 Discover 78.00 MasterCard 53.20 Proprietary Card en PAS... resusc Female Married Female Married Female Married Female Married I Female Married Female Married Married Female Female Married Female Married Female Married Female Married Female Married Male Married Female Single Female Single Female Married Female Female Female Married Married Married Married Single Female Married Female Single Female Married Female Single Female Married Female Married Female Married Female Married Male Married Female Married Female Married Female Married Single Married Female Female Married Female Female Married Female Mamiod Female Married Female Female Female Female Female Female Married Married Married Single 58#*#&&&&&&1 42 46 48 54 38 60 46 30 32 42 46 38 20 62 28 68 32 38 54 48 54 30 32 22 32 74 46 50 38 54 68 30 46 30 54 42 48 62 34 28 46

60 Promotional 61 Promotional 62 Promotional 63 Promotional Promotional Promotional 66 Promotional Promotional 64 65 5338 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 Promotional Promotional Promotional Promotional Promotional Regular Promotional Promotional Promotional Regular Promotional Promotional Regular Promotional Promotional Promotional Promotional Regular Promotional Regular Regular Promotional Promotional Promotional Promotional Regular Promotional Regular Regular Promotional Promotional Promotional Promotional 1 3 5 1 2 1 2 5 2 8 5 4 1 2 2 4 2 4 3 2 2 6 4 3 2 113.00 Proprietary Card 108,80 Proprietary Card 59.91 Proprietary Card 53.60 Proprietary Card 31.60 Proprietary Card 49.50 Proprietary Card 39.60 Proprietary Card 59.50 Proprietary Card 146.80 Proprietary Card 47.20 Proprietary Card 95.05 Proprietary Card 2 1 155.32 Proprietary Card 58.00 MasterCard 69.00 Proprietary Card 46.50 Proprietary Card 45.22 Proprietary Cand 84.74 Proprietary Card 39.00 Proprietary Card 111.14 Proprietary Card 86.80 Proprietary Card 89.00 Discover 78.00 MasterCard 53.20 Proprietary Card $8.50 Visa 46.00 Proprietary Card 37.50 Visa 20.80 Proprietary Card 144.00 MasterCard T 6 4 -107.00 Proprietary Card 31.60 Proprietary Card 1 6- 4 57.60 Proprietary Card 95.20 Proprietary Card 1 22.42 Proprietary Card 5 17 159.75 Proprietary Card 229.50 Proprietary Card 3 66.00 American Express 1 39.50 MasterCard 9 253.00 Proprietary Card 10 287.59 Proprietary Card 47.60 Proprietary Card 28.44 Proprietary Card Female Female Female Female Female Female Female Female Female Male Female Female Female Female Female Female Female Female Female Female Female Female Female Female Female Female Female Female Female Female Female Single Married Single Married Single Married Married Married Married Married Married Married Married Single Married Married Married Married Married Married Married Married Single Married Married Married Married Single Married Single Married Female Married Female Female Married Married Female Female Female Female Female Female Female Married Married Married Married Married Married Married 50 46 30 54 2125823535X & IBX 42 48 62 34 28 46 54 30 74 62 42 54 68 30 #35 #$%II ABB%5 36 44 44 62 48 36 20 54 54 72 30 46 44 30 52 30 44