Question

For each of the following research questions, specify the parameter and the value that constitute the null hypothesis of "parameter = null value." In other words, define the population parameter of interest and specify the null value that is being tested.

a) Do a majority of Americans between the ages of 18 and 30 think that the use of marijuana should be legalized?

The proportion of adult Americans between the ages of 21 and 32 who think the use of marijuana should be legalized.

The difference between the mean number of adult Americans between the ages of 21 and 32 who think the use of marijuana should be legalized and the mean number of those who do not.

The mean number of adult Americans between the ages of 21 and 32 who think the use of marijuana should be legalized.

Null value =  


b) Is the mean score of a certain test in a given year different from the target mean of 600 set by the test developers?

The mean test score in a given year.

The difference between the number of test scores greater than 600 and the number of test scores less than 600 in a given year.

The proportion of test scores greater than 600 in a given year.

Null value =  


c) Is the mean age of death for left-handed people lower than that for right-handed people?

The mean ages of death for left and right handed people.

The difference in the mean ages of death for left and right handed people.

The proportion of right handed people who live longer than left handed people.

Null value =  


d) Is there a difference in the proportions of male and female college students who smoke cigarettes?

The mean number of male college students that smoke more than female college students.

The proportion of male college students that smoke more than female college students.

The difference between the proportion of male college students that smoke and the proportion of female college students that smoke.

Null value =

Answer 1