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A random sample of vehicles n=36 were selected and fitted with a new brake design. a standardized...

A random sample of vehicles n=36 were selected and fitted with a new brake design. a standardized breaking test was then performed on all the vehicles and the stopping distance was recorded. the population stopping distance using this test is a mean of 65 ft with a standard deviation of 12 ft. you find the mean stopping distance for your sample is 60 ft. your job is to determine if the new brake design significantly decreased the stopping distance of these vehicles at an alpha level of .05

1. compute the test statistic (z test) for this sample.

2. what is the z critical value for a one tailed (directional) z test in the negative direction with an alpha = .05

3. what is your statistical decision and conclusion regarding the effectiveness of the new brake design?

math   Statistics-And-Probability   
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Answer #1

Pee Sample mean ←-60 1 1236 tne tailed. Koit =-1,645 The test Mataticマlies en the aepdien7eabr . ho reject Ho Thes ciunt wid

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