Review Creating & Interpreting Data Displays

Front

What is an explanatory variable?

Back

An explanatory variable is a variable that is manipulated or changed in an experiment to observe its effect on a response variable.

Front

What is the mean of a data set?

Back

The mean is the average of a set of numbers, calculated by adding all the values together and dividing by the number of values.

Front

What is the median of a data set?

Back

The median is the middle value of a data set when the numbers are arranged in order. If there is an even number of values, the median is the average of the two middle numbers.

Front

What type of data is best represented by bar graphs?

Back

Bar graphs are best used to represent categorical data, which consists of distinct categories or groups.

Front

What does a correlation coefficient of r ≈ -0.8 indicate?

Back

A correlation coefficient of r ≈ -0.8 indicates a strong negative correlation between two variables, meaning as one variable increases, the other tends to decrease.

Front

How do you calculate the mean of the following data set: 47, 49, 54, 50, 48, 47, 55?

Back

Mean = (47 + 49 + 54 + 50 + 48 + 47 + 55) / 7 = 50.

Front

How do you find the median of the following data set: 47, 49, 54, 50, 48, 47, 55?

Back

First, arrange the data in order: 47, 47, 48, 49, 50, 54, 55. The median is the middle value, which is 49.

Front

What is a uniform distribution?

Back

A uniform distribution is a type of distribution in which all outcomes are equally likely; each value has the same probability of occurring.

Front

What is categorical data?

Back

Categorical data is data that can be divided into groups or categories that do not have a numerical value, such as colors, names, or types.

Front

What is the purpose of a scatter plot?

Back

A scatter plot is used to display the relationship between two quantitative variables, showing how one variable may affect another.