Estimate the mean useful life of a brand

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Cutting Speed (meters per minute) Useful Life Brand A (Hours) Useful Life Brand B (Hours)

30 5.1 5.9

30 3.6 6.5

30 4.8 4.7

40 4.9 5.0

40 4.4 4.6

40 2.5 5.0

50 4.4 4.5

50 2.8 4.0

50 1.0 3.7

60 4.0 3.8

60 2.0 3.0

60 1.1 2.4

70 1.1 1.5

70 0.5 2.0

70 3.0 1.0

Use a 95?% confidence interval to estimate the mean useful life of a brand A cutting tool when the cutting speed is

45 meters per minute. Repeat for brand B. Compare the widths of the two intervals and comment on the reasons for any difference

The mean useful life of a brand A cutting tool when the cutting speed is 45 meters per minute is____to_____hours.

Reference no: EM131533249

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