Question

This Question: 5 pts 4 of 5 (3 complete) This Quiz: 25 pts possible Question Help Financial analysts know that January credit card charges will generally be much lower than those of the month he accompanying data set contains the monthly credit card charges of a random sample ol 99 cardhokde before. What about the difference between January and the next month s Complete parts a) through e) bekow Click the icon to view the monthly credit card charges b) How much, on average, will cardhokders who charged $2000 in January charge in February? (Round to the nearest cent as needed.) 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. Click to select your answerís) 03:57 all 96 8 7 5 6 4 u-

January   February
904.26   641.28
7214.25   4569.29
4234.27   2267.96
79.94   299.72
4043.51   1376.97
89.34   -120.83
3291.24   1927.78
2418.33   2610.63
83.88   144.81
6.42   392.68
0   40.48
564.23   295.82
2715.11   848.78
187.15   162.09
3265.33   2411.81
1525.05   956.79
1359.03   38.01
733.88   2657.81
75.16   64.89
70.26   -70.25
634.37   1860.98
1041.29   478.41
553.33   994.54
1016.79   774.13
1305.45   3365.66
249.35   5.54
48.79   96.89
872.19   890.51
485.45   485.61
616.27   1484.08
1573.04   889.57
422.45   391.95
770.17   323.65
56.54   0
1484.99   2253.41
495.42   389.59
1065.47   1066.84
510.79   131.48
5647.13   4946.21
5.49   5.49
871.74   591.65
1634.63   3361.23
92.28   85.99
669.61   1365.63
829.68   281.02
69.19   68.02
830.54   1057.96
2302.27   3318.67
270.26   14.13
210.57   160.49
1012.02   519.25
1044.69   2021.48
298.49   635.32
-29.98   0
1634.81   392.95
1730.82   1322.88
0   65.14
31.39   28.77
4.95   77.14
1088.92   892.03
26.91   29.02
120.12   32.19
2009.06   816.67
291.17   778.79
103.93   0
52.96   66.22
2842.02   1530.96
675.25   293.58
221.55   171.79
37.76   4.78
533.74   881.07
1932.23   1063.72
692.53   914.28
6798.25   5945.45
393.38   466.28
1308.56   303.29
796.82   497.37
0   266.53
1040.98   59.44
565.41   206.83
339.28   411.85
5280.72   5317.82
40.11   72.66
43.37   38.41
653.73   480.12
1070.86   417.03
2333.78   1790.02
91.47   175.06
1432.69   1107.89
720.58   308.07
28.62   24.18
981.14   1216.71
1576.53   1810.41
0   468.33
161.91   147.84
494.27   1993.91
533.43   936.04
462.21   114.55
1477.17   2094.09

please answer part B) - D)

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Answer 1

(b) Linear Regression equation: February 164.3449+0.7235January When average charged in January is $2000, then in February 164.3449+0.7235 2000$1611.35 Ans: $1611.35 c) Let rJanuary, y -February then x = sample mean of x = 1055.321, Sr,-Žrf-9922-192763164 MSEmean sum of square due error 441031, to.025,97 1.9847, n-99. yo-1611.35 then 95% C.I. for the average February charges of cardholder s who charged $2000 in January (2000-х)2 (2000--)2 7l ($1451.38, $1771.32) (d 95% C.1 . for the average decrease in the charges of cardholders who changed $2000 in January is 2000 1771.32 228.68, 2000 1451.38 548.62) Answer: ($228.68, $548.62)