Mathematics, 06.08.2019 03:30 jeffreyaxtell4542
The manager of a fleet of automobiles is testing two brands of radial tires and assigns one tire of each brand at random to the two rear wheels of eight cars and runs the cars until the tires wear out. the data (in kilometers) follow. find a 99% confidence interval on the difference in the mean life.
car brand 1 brand 2
1 37734 35202
2 45299 41635
3 36240 35500
4 32100 31950
5 37210 38015
6 48360 47800
7 38200 37810
8 33500 33215
(a) calculate d=
(b) calculate sd =
(c) calculate a 99% two-sided confidence interval on the difference in mean life.
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