A special bumper was installed on selected vehicles in a large fleet. The dollar cost of body repairs was recorded for all vehicles that were involved in accidents over a 1-year period. Those with the special bumper are the test group and the other vehicles are the control group, shown below. Each "repair incident" is defined as an invoice (which might include more than one separate type of damage).

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The confidence interval for the true differences of the means assuming equal variance will be 1369.6, 69.7.

How to illustrate the information?

It should be noted that a confidence interval simply means the mean of the estimate plus and minus the variation that is in the estimate.

Based on the information, it should be noted that the critical value is given as 2.131. Therefore, the 95% confidence interval will be:.

= (1073 - 1723) -/- 2.131 × ✓(664)²/12 + ✓(816²/9)

= -650 +/- 719.715

= -1369.6, 69.7

Therefore, the confidence interval for the true differences of the means assuming equal variance will be 1369.6, 69.7.

Complete question:

The remainder of the question is to construct a 95 percent confidence interval for the true differences if the means assuming equal variance.

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