Assume that you know the average speed of cars on a highway is 55mph and it\'s p

Question

Assume that you know the average speed of cars on a highway is 55mph and it's population standard error of the mean is 4mph. In order to prove whether the average car speed on that highway has changed or not you took a sample of 25 cars, and found their average speed is 60.4mph and the sample standard deviation to be 10mph
Which of the following correctly states the null hypothesis you wish to test.
A. M=55 B. M=60.4 C. M is greater than or equal to 55 D. M is less than or equal to 60.4 E. None of the above Assume that you know the average speed of cars on a highway is 55mph and it's population standard error of the mean is 4mph. In order to prove whether the average car speed on that highway has changed or not you took a sample of 25 cars, and found their average speed is 60.4mph and the sample standard deviation to be 10mph
Which of the following correctly states the null hypothesis you wish to test.
A. M=55 B. M=60.4 C. M is greater than or equal to 55 D. M is less than or equal to 60.4 E. None of the above
Which of the following correctly states the null hypothesis you wish to test.
A. M=55 B. M=60.4 C. M is greater than or equal to 55 D. M is less than or equal to 60.4 E. None of the above

Explanation / Answer

A. Null Hypothesis (Ho): M=55.
     Alt Hyp,H1 : M!=55.

Null hypothesis is defined on the population parameters that is tested to disprove .

In this case, we can thus reject H0 / accept H1.

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