Question

1. The head of public safety notices that the average driving speed at a particular intersection averages 45 mph with a standard deviation of 9 mph. The head of public safety thinks that putting a school speed limit sign of 30mph will decrease the speed at the intersection. After a school speed limit sign of 30 mph is placed at the intersection, the first 35 cars travel past at an average speed of 38 mph. Using the .01 significance level, was there a significant change in driving speed? Use the five steps of hypothesis testing and Calculate and interpret the effect size of the experimental manipulation.

          1. The head of public safety notices that the average driving
speed at a particular intersection averages 45 mph with a standard
deviation of 9 mph. The head of public safety thinks that putting a
school speed limit sign of 30mph will
decrease the speed at the intersection.
After a school speed limit sign of 30 mph is placed at the
intersection, the first 35 cars travel past at an average
speed of 38 mph. Using the .01 significance level, was
there a significant change in driving speed? Use the five
steps of hypothesis testing and Calculate and interpret
the effect size of the experimental manipulation.

Show more…

Added by Tony R.

Elementary Statistics a Step by Step Approach

Allan G. Bluman 9th Edition

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Solved by Expert David Nguyen

06/28/2022

Step 1

Mathematically, \( \mu = 45 \) mph. - Alternative Hypothesis (\(H_a\)): The average driving speed at the intersection has decreased after placing the school speed limit sign. Mathematically, \( \mu < 45 \) mph. Show more…

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1. The head of public safety notices that the average driving speed at a particular intersection averages 45 mph with a standard deviation of 9 mph. The head of public safety thinks that putting a school speed limit sign of 30mph will decrease the speed at the intersection. After a school speed limit sign of 30 mph is placed at the intersection, the first 35 cars travel past at an average speed of 38 mph. Using the .01 significance level, was there a significant change in driving speed? Use the five steps of hypothesis testing and Calculate and interpret the effect size of the experimental manipulation.

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