Which of the following would be an appropriate null hypothes

Which of the following would be an appropriate null hypothesis? The mean of a sample is equal to 55. The mean of a population is equal to 55. The mean of a population is greater than 55. Only (a) and (c) are true.

Solution

The mean of a population is equal to 55

that is the appropriate null hypothesis because we always want the mean of a population , not of a sample

and is the best appropriate because you always will find that null hypothesis will have an equal sign