January February 904.01 641.66 7215.58 4569.93 4235.62 2267.97 79.97 299.87 4038

Question

January February 904.01 641.66 7215.58 4569.93 4235.62 2267.97 79.97 299.87 4038.69 1377.29 89.33 -120.69 3288.49 1928.98 2417.83 2607.71 83.84 144.76 6.42 393.26 0 40.44 564.58 295.58 2715.27 848.59 187.13 162.01 3264.49 2413.35 1524.89 956.72 1360.17 38.03 733.81 2657.61 75.04 64.96 70.22 -70.33 633.62 1863.53 1041.44 478.45 553.55 994.57 1017.52 774.09 1303.48 3365.12 249.44 5.54 48.79 96.94 873.28 891.13 485.03 485.76 616.64 1484.51 1572.24 890.09 422.21 391.93 770.25 323.39 56.56 0 1486.63 2250.01 496.13 389.68 1064.75 1065.24 509.87 131.49 5641.33 4945.44 5.51 5.51 871.56 591.33 1635.12 3359.86 92.12 85.94 669.68 1365.49 829.08 280.73 69.17 67.93 831.74 1056.67 2300.57 3315.35 270.58 14.13 210.37 160.56 1011.23 519.02 1044.87 2023.77 298.63 634.92 -29.98 0 1635.93 393.37 1732.88 1324.58 0 65.08 31.39 28.77 4.95 77.13 1087.82 892.43 26.91 29.03 120.28 32.23 2007.22 816.47 291.22 778.86 104.04 0 52.97 66.27 2838.28 1531.21 674.94 293.49 221.85 171.85 37.81 4.78 533.27 881.57 1933.25 1062.82 692.47 914.33 6803.32 5941.58 393.39 466.15 1308.32 303.13 797.04 497.52 0 266.63 1039.85 59.44 564.65 206.78 339.07 411.73 5279.21 5322.05 40.13 72.67 43.33 38.47 653.34 480.24 1071.53 416.56 2336.27 1788.49 91.41 175.24 1432.82 1107.79 720.38 307.72 28.59 24.16 981.23 1216.36 1578.18 1811.49 0 468.26 161.98 147.79 493.62 1993.37 534.02 935.44 462.07 114.64 1478.47 2094.43 c) Give a 95% confidence interval for the average February charges of cardholders who charged $2000 in January. (Round to the nearest cent as needed d) From part c), give a 95% confidence interval for the average decrease in the charges of cardholders who charged $2000 in January. (Round to the nearest cent as needed.) e) What reservations, if any, would a researcher have about the confidence intervals made in parts c) and d)? Select all that apply. U A. The data are not independent, so the confidence intervals are not valid B. The residuals show a curvilinear pattern, so the confidence intervals may not be valid C. The residuals show increasing spread, so the confidence intervals may not be valid. D. The data are not linear, so the confidence intervals are not valid E. A researcher would not have any reservations. The confidence intervals are valid

Explanation / Answer

C) 95% confidence interval for average february charges is (1451.55, 1771.42)

D) 95% confidence interval for average decerease is (228.58, 548.45)

E) C : residuals show increasing spread

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