# Chapter 1. Explanatory and response variables

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Stat Tutor
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4:41

### Question 1.1

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Incorrect. The outcome variable is measured at the end of a study and is called the response variable.
Correct. The outcome variable is measured at the end of a study and is called the response variable.
Incorrect. Try again.
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### Question 1.2

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Incorrect. It's called the explanatory variable because we think it might explain changes in the response variable.
Correct. It's called the explanatory variable because we think it might explain changes in the response variable.
Incorrect. Try again.
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7:52

### Question 1.3

Incorrect. ACT math score, college algebra grade, a male's height at age 4 and his height as an adult are all quantitative variables. Only gender and whether a person exercises are categorical.
Correct. ACT math score, college algebra grade, a male's height at age 4 and his height as an adult are all quantitative variables. Only gender and whether a person exercises are categorical.
Incorrect. Try again.
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8:01

### Question 1.4

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Incorrect. The predictor variable is the explanatory variable. Here we want to use outside daily temperature for our prediction, so it is the explanatory variable.
Correct. The predictor variable is the explanatory variable. Here we want to use outside daily temperature for our prediction, so it is the explanatory variable.
Incorrect. Try again.
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9:15

### Question 1.5

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Incorrect. We always plot the data first so that we know whether the model we want to use is an appropriate one. For example, if the relationship is not linear, we don't want to model the relationship with a line.
Correct. We always plot the data first so that we know whether the model we want to use is an appropriate one. For example, if the relationship is not linear, we don't want to model the relationship with a line.
Incorrect. Try again.
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### Question 1.6

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Incorrect. We need two quantitative variables that have a linear relationship in order to model with a straight line.
Correct. We need two quantitative variables that have a linear relationship in order to model with a straight line.
Incorrect. Try again.
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