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COMFY wonders whether there are differences across pairs of cities that receive same discount.

Find a 95% confidence interval for the differnce between the mean amount spent in TUCSON and the similar mean in San Diego. (These means should include the "0 PURCHASES.) Repeat this for the difference between Phoenix and Santa Fe and then between Riverside and Albuquerque. Does City appear to make a difference?

Customer City Discount Purchased Total Paid 1 Tucson 5% 0 0 2 Tucson 5% 1 409 3 Tucson 5% 0 0 4 Tucson 5% 1 395 5 Tucson 5% 0 0 6 Tucson 5% 0 0 7 Tucson 5% 1 229 8 Tucson 5% 1 340 9 Tucson 5% 0 0 10 Tucson 5% 1 294 11 Tucson 5% 0 0 12 Tucson 5% 0 0 13 Tucson 5% 0 0 14 Tucson 5% 1 325 15 Tucson 5% 1 381 16 Tucson 5% 0 0 17 Tucson 5% 0 0 18 Tucson 5% 0 0 19 Tucson 5% 0 0 20 Tucson 5% 0 0 21 Tucson 5% 0 0 22 SanDiego 5% 0 0 23 SanDiego 5% 1 602 24 SanDiego 5% 1 516 25 SanDiego 5% 0 0 26 SanDiego 5% 1 591 27 SanDiego 5% 0 0 28 SanDiego 5% 0 0 29 SanDiego 5% 0 0 30 SanDiego 5% 1 643 31 SanDiego 5% 1 523 32 SanDiego 5% 0 0 33 SanDiego 5% 0 0 34 SanDiego 5% 1 468 35 SanDiego 5% 0 0 36 SanDiego 5% 0 0 37 SanDiego 5% 0 0 38 SanDiego 5% 0 0 39 SanDiego 5% 0 0 40 SanDiego 5% 1 595 41 SanDiego 5% 0 0 42 SanDiego 5% 0 0 43 SanDiego 5% 0 0 44 SanDiego 5% 0 0 45 SanDiego 5% 0 0 46 SanDiego 5% 1 562 47 Phoenix 10% 1 365 48 Phoenix 10% 1 350 49 Phoenix 10% 0 0 50 Phoenix 10% 0 0 51 Phoenix 10% 0 0 52 Phoenix 10% 0 0 53 Phoenix 10% 0 0 54 Phoenix 10% 1 333 55 Phoenix 10% 1 338 56 Phoenix 10% 2 568 57 Phoenix 10% 0 0 58 Phoenix 10% 1 369 59 Phoenix 10% 0 0 60 Phoenix 10% 1 360 61 Phoenix 10% 1 326 62 Phoenix 10% 2 523 63 Phoenix 10% 2 530 64 Phoenix 10% 0 0 65 Phoenix 10% 0 0 66 Phoenix 10% 1 338 67 Phoenix 10% 1 305 68 Phoenix 10% 2 664 69 Phoenix 10% 2 461 70 Phoenix 10% 0 0 71 Phoenix 10% 1 395 72 Phoenix 10% 1 284 73 Phoenix 10% 0 0 74 Phoenix 10% 0 0 75 Phoenix 10% 2 568 76 Phoenix 10% 1 260 77 Phoenix 10% 0 0 78 SantaFe 10% 1 307 79 SantaFe 10% 1 397 80 SantaFe 10% 0 0 81 SantaFe 10% 0 0 82 SantaFe 10% 1 337 83 SantaFe 10% 0 0 84 SantaFe 10% 2 661 85 SantaFe 10% 0 0 86 SantaFe 10% 0 0 87 SantaFe 10% 1 368 88 SantaFe 10% 1 408 89 SantaFe 10% 0 0 90 SantaFe 10% 1 392 91 SantaFe 10% 2 814 92 SantaFe 10% 1 386 93 SantaFe 10% 0 0 94 SantaFe 10% 1 387 95 SantaFe 10% 1 310 96 SantaFe 10% 0 0 97 Riverside 15% 0 0 98 Riverside 15% 0 0 99 Riverside 15% 0 0 100 Riverside 15% 2 1024 101 Riverside 15% 1 451 102 Riverside 15% 1 433 103 Riverside 15% 0 0 104 Riverside 15% 0 0 105 Riverside 15% 1 436 106 Riverside 15% 2 854 107 Riverside 15% 1 496 108 Riverside 15% 0 0 109 Riverside 15% 1 422 110 Riverside 15% 0 0 111 Riverside 15% 0 0 112 Riverside 15% 1 398 113 Riverside 15% 1 409 114 Riverside 15% 1 551 115 Riverside 15% 1 458 116 Riverside 15% 1 520 117 Riverside 15% 2 788 118 Riverside 15% 1 373 119 Riverside 15% 0 0 120 Riverside 15% 0 0 121 Riverside 15% 1 367 122 Albuquerque 15% 2 412 123 Albuquerque 15% 1 253 124 Albuquerque 15% 0 0 125 Albuquerque 15% 1 200 126 Albuquerque 15% 0 0 127 Albuquerque 15% 0 0 128 Albuquerque 15% 2 648 129 Albuquerque 15% 2 315 130 Albuquerque 15% 1 264 131 Albuquerque 15% 1 234 132 Albuquerque 15% 1 260 133 Albuquerque 15% 2 632 134 Albuquerque 15% 2 587 135 Albuquerque 15% 0 0 136 Albuquerque 15% 1 210 137 Albuquerque 15% 1 298 138 Albuquerque 15% 1 244 139 Albuquerque 15% 1 284 140 Albuquerque 15% 1 239 141 Albuquerque 15% 1 201 COMFY wonders whether there are differences across pairs of cities that receive same discount. A) Find a 95% confidence interval for the differnce between the mean amount spent in TUCSON and the similar mean in San Diego. (These means should include the "0 PURCHASES.) Repeat this for the difference between Phoenix and Santa Fe and then between Riverside and Albuquerque. Does City appear to make a difference? HINT: USE ANOVA to answer part (a) B) Repeat part a, but instead of analyzing difference between means, analyze difference between proportion of customers who purchase something. Does City appear to make a difference?

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29 City
Tucson
Tucson
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Tucson
Tucson
Tucson
Tucson
Tucson
Tucson
Tucson
Tucson
Tucson
Tucson
Tucson
Tucson...

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