For a particular car when the brake is applied at 62 mph, Ask an Expert

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For a particular car, when the brake is applied at 62 mph, the following data give stopping distance (in feet) for 10 random trials on a dry surface. (Source: http:// www.nhtsa.dot.gov/cars/testing/brakes/b.pdf.)

146.9 148.4 149.4 148.6 150.3
147.5 147.5 149.3 148.4 145.5

(a) Can we say that the data are approximately normally distributed?

(b) Find a 95% con?dence interval for population mean stopping distance μ.

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