Which of the following best describes the difference between $univariate$ data and $bivariate$ data?

• A. $Univariate$ data always requires a graphing calculator, while $bivariate$ data does not.
• B. $Univariate$ data involves comparing two groups, while $bivariate$ data involves only one group.
• C. $Univariate$ data is used only for categorical variables, while $bivariate$ data is used only for numerical variables.
• D. $Univariate$ data consists of observations on a single variable, while $bivariate$ data consists of observations on two variables for each subject.

Answer: (D)

Verified step by step guidance

1. Step 1: Understand the definition of univariate data. Univariate data consists of observations on a single variable. This means each data point represents one characteristic or measurement for each subject or unit.
2. Step 2: Understand the definition of bivariate data. Bivariate data consists of observations on two variables for each subject. This means each data point includes two related measurements or characteristics for the same subject.
3. Step 3: Recognize that univariate data focuses on analyzing one variable at a time, such as calculating measures like mean, median, or creating histograms for that single variable.
4. Step 4: Recognize that bivariate data involves studying the relationship between two variables, such as using scatterplots, correlation, or regression analysis to understand how the variables interact.
5. Step 5: Compare the given answer choices by matching them against these definitions, and identify that the correct description is: 'Univariate data consists of observations on a single variable, while bivariate data consists of observations on two variables for each subject.'