Question 333211: You are measuring the response of a new automobile braking system and are determining skid distance during panic braking.
You are willing to accept an error of 2 feet.
You choose to work at the 5% level of significance.
From historical data, you know that the range of data for all skidding stops is about 24 feet
Thank you!
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! You are measuring the response of a new automobile braking system and are determining skid distance during panic braking.
You are willing to accept an error of 2 feet.
You choose to work at the 5% level of significance.
From historical data, you know that the range of data for all skidding stops is about 24 feet
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Since the range is 24 ft, 6*sigma = 24.
Therefore the standard deviation = 4
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Sample size = [z*s/E]^2 = [1.96*4/2]^2 = 15.36
Rounding up, n = 16.
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Cheers,
Stan H.
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