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 36,925 34,318 2 45,300 42,280 3 36,256 35,548 4 32,100 31,950 5 37,210 38,015 6 48,360 47,800 7 38,200 37,810 8 33,500 33,215 Round your answer to 2 decimal places. Do not use commas. SHO S HD

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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
36,925
34,318
2
45,300 42,280
3
36,256 35.548
4
32,100 31,950
5
37,210 38,015
6
48,360 47,800
7
38.200 37,810
8
33,500 33,215
Round your answer to 2 decimal places. Do not use commas.
<MD ≤
S
i
Transcribed Image Text: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 36,925 34,318 2 45,300 42,280 3 36,256 35.548 4 32,100 31,950 5 37,210 38,015 6 48,360 47,800 7 38.200 37,810 8 33,500 33,215 Round your answer to 2 decimal places. Do not use commas. <MD ≤ S i
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