How much noisier are streets where cars travel faster? An article reports noise levels in decibels and average speed in kilometers per hour for a sample of roads. The following table presents the results. NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Speed 28.26 Noise 78.1 36.22 79.6 38.73 81.0 29.07 78.7 30.28 78.6 30.25 78.4 29.03 78.4 33.17 79.6
How much noisier are streets where cars travel faster? An article reports noise levels in decibels and average speed in kilometers per hour for a sample of roads. The following table presents the results. NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Speed 28.26 Noise 78.1 36.22 79.6 38.73 81.0 29.07 78.7 30.28 78.6 30.25 78.4 29.03 78.4 33.17 79.6
Mathematics For Machine Technology
8th Edition
ISBN:9781337798310
Author:Peterson, John.
Publisher:Peterson, John.
Chapter29: Tolerance, Clearance, And Interference
Section: Chapter Questions
Problem 16A: Spacers are manufactured to the mean dimension and tolerance shown in Figure 29-12. An inspector...
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Question
A)
Find a 95% confidence interval for the
The 95% confidence interval for the mean is?
Expert Solution
Step 1
For the variable noise level in streets, using Excel to calculate the values of sample mean and standard deviation as:
The function
gives Mean = 79.05 and the function
gives standard deviation s = 0.96214
The 95% confidence interval for mean noise level is given as:
where
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