One use of a regression line is:
A) To determine if any x-values are outliers
B) To determine if any y-values are outliers
C) To determine if a change in x causes a change in y
D) To estimate the change in y for a one-unit change in x
Which one of the following variables is not categorical?
A) Age of a person
B) Gender of a person: male or female
C) Choice on a test item: true or false
D) Marital status of a person (single, married, divorced, other)
A chi-square test of the relationship between personal perception of emotional health and marital status led to rejection of the null hypothesis, indicating that there is a relationship between these two variables. One conclusion that can be drawn is:
A) Marriage leads to better emotional health
B) Better emotional health leads to marriage
C) The more emotionally healthy someone is, the more likely they are to be married
D) There are likely to be confounding variables related to both emotional health and marital status
A magazine printed a survey in its monthly issue and asked readers to fill it out and send it in. Over 1000 readers did so. This type of sample is called:
A) A cluster sample
B) A self-selected sample
C) A stratified sample
D) A simple random sample

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