The accompanying data indicate the prices of 155 used luxury cars. Some have four-wheel drive (the model identified by the Xi type), and others two-wheel drive (the model denoted simply by the letter i). Complete parts (a) and (b).
Price Type Year
31895 i 2005
26095 i 2002
21995 i 2001
25795 i 2002
25095 i 2002
27095 xi 2002
28795 xi 2002
28895 i 2002
29195 i 2002
35495 i 2004
41775 i 2002
30895 i 2003
31795 i 2002
28895 xi 2002
27995 xi 2002
31900 i 2004
32900 i 2005
28800 i 2003
29800 i 2002
29900 i 2002
29100 i 2002
25700 i 2002
28600 xi 2003
29000 xi 2002
26700 xi 2003
28700 xi 2002
29000 xi 2002
29190 xi 2002
31800 xi 2004
30600 xi 2003
31800 i 2002
33100 xi 2002
32000 xi 2002
28195 i 2003
29695 i 2002
27695 xi 2002
29695 xi 2002
35195 xi 2004
30195 i 2002
33695 i 2004
27800 i 2002
19695 i 2001
23995 i 2001
28795 i 2003
25095 i 2003
29095 i 2002
25700 i 2002
28895 xi 2003
28195 xi 2002
32900 xi 2003
28100 i 2003
25800 i 2002
24700 i 2002
27800 i 2003
26400 i 2002
25900 i 2002
25200 i 2002
26000 i 2002
24800 i 2002
28900 xi 2003
29100 xi 2003
28700 xi 2003
27100 xi 2002
30000 i 2002
33400 xi 2002
29200 xi 2002
33000 xi 2002
33800 xi 2004
35800 xi 2004
31195 i 2006
26895 i 2003
29195 i 2003
24595 xi 2002
26695 xi 2003
31495 xi 2003
41195 i 2006
34695 i 2004
39695 i 2006
32195 xi 2003
28600 i 2003
20800 i 2001
25000 i 2002
26900 i 2003
24700 i 2002
27000 i 2002
28000 i 2003
27700 i 2003
26800 xi 2002
27100 xi 2003
32900 i 2004
31100 xi 2002
28889 i 2003
29789 i 2003
28889 i 2003
28989 i 2003
31989 i 2004
30898 xi 2002
31889 xi 2003
29889 xi 2003
29989 xi 2002
34189 xi 2004
39789 i 2006
24689 i 2001
25089 i 2003
35789 i 2004
35789 xi 2005
32089 xi 2003
36189 xi 2003
33889 xi 2002
31689 xi 2002
26885 i 2002
23185 i 2001
25975 i 2002
25075 i 2002
25575 i 2002
26685 i 2002
28685 i 2004
32185 i 2004
30185 i 2004
33685 i 2004
29885 xi 2002
30085 xi 2002
28985 xi 2003
27695 xi 2002
27075 xi 2002
26085 xi 2002
29675 xi 2003
32885 i 2003
30195 i 2002
27995 i 2002
33185 i 2002
29895 i 2002
22785 i 2001
25390 i 2002
24990 i 2003
24490 i 2002
28990 i 2004
28390 i 2002
28790 i 2002
28990 xi 2002
26195 i 2003
22795 i 2001
27200 i 2003
33095 xi 2005
29795 xi 2003
28300 i 2002
32095 i 2003
34195 xi 2003
24890 i 2001
22125 i 2002
27890 xi 2002
28150 xi 2002
30025 xi 2004
24190 i 2001
31690 xi 2002
a)
95% confidence interval
Two-Sample T-Test and CI: XI, I
Two-sample T for XI vs I
N Mean StDev SE Mean
XI 61 30210 2665
341
I 94 28487
4154 428
Difference = μ (XI) - μ (I)
Estimate for difference: 1724
95% CI for difference: (642, 2806)
The accompanying data indicate the prices of 155 used luxury cars. Some have four-wheel drive (the...