A county is considering raising the speed limit on a road because they claim that the mean speed of vehicles is greater than 40 mi/hr. A random sample of 15 vehicles has a mean speed of 43 mil/hr and a standard deviation of 4.4 mi/hr. Assume that speeds follow a normal distribution. What statistical test should be used to test the claim?
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A county is considering raising the speed limit on a road because they claim that the mean speed of vehicles is greater than 40 mi/hr. A random sample of 15 vehicles has a mean speed of 43 mil/hr and a standard deviation of 4.4 mi/hr. Assume that speeds follow a
What statistical test should be used to test the claim?
(pick one of the options)
1. t-test
2. 2.73
3. 15
4. 10.9
5. 14
6. z-test
7. 2.52
8. 2.64
Calculate the value of standardized test statistic.
(pick one of the options)
1. t-test
2. 2.73
3. 15
4. 10.9
5. 14
6. z-test
7. 2.52
8. 2.64
What is the degree of the freedom for the distribution of the test statistics.
(pick one of the options)
1. t-test
2. 2.73
3. 15
4. 10.9
5. 14
6. z-test
7. 2.52
8. 2.64
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