Author Question: An inventor has developed a new spray coating that is designed to improve the wear of bicycle tires. ... (Read 136 times)

stock · **on:** Feb 14, 2020

An inventor has developed a new spray coating that is designed to improve the wear of bicycle tires. To test the new coating, the inventor randomly selects one of the two tires on each of 50 bicycles to be coated with the new spray. The bicycle is then driven for 100 miles and the amount of the depth of the tread left on the two bicycle tires is measured (in millimeters). It is desired to determine whether the new spray coating improves the wear of the bicycle tires. The data and summary information is shown below:

Coated

Non-Coated

Difference

Mean 1.38 0.85 0.53

Std. Dev. 0.12 0.11 0.06

Sample Size 50 50 50

Use the summary data to construct a 90% confidence interval for the difference between the means.
◦ 0.53 ± 0.01396
◦ 0.53 ± 0.01663
◦ 0.53 ± 0.04512
◦ 0.53 ± 0.03787

amynguyen1221 · **Reply #1 on:** Feb 14, 2020

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