Chapter 2 Review #1

Front

What is the explanatory variable in a study?

Back

The explanatory variable is the variable that is manipulated or changed to observe its effect on the response variable. In the context of the coffee and temperature example, the explanatory variable is Outdoor Temperature.

Front

What does a correlation coefficient (r) of -0.777 indicate?

Back

A correlation coefficient (r) of -0.777 indicates a Strong Negative Correlation, meaning that as one variable increases, the other variable tends to decrease.

Front

What type of graph is best for comparing categorical data between two groups?

Back

A Segmented Bar Graph is best for comparing categorical data between two groups, as it visually represents the proportion of each category within the groups.

Front

What does a correlation coefficient (r) of 0.222 indicate?

Back

A correlation coefficient (r) of 0.222 indicates a Weak Positive Correlation, meaning there is a slight tendency for one variable to increase as the other variable increases.

Front

What percentage of SUVs are driven by women according to the data?

Back

86.5% of SUVs are driven by women.

Front

Define correlation in statistics.

Back

Correlation is a statistical measure that describes the extent to which two variables change together. It can be positive, negative, or zero.

Front

What is the range of correlation coefficients?

Back

The range of correlation coefficients is from -1 to +1, where -1 indicates a perfect negative correlation, +1 indicates a perfect positive correlation, and 0 indicates no correlation.

Front

What is a scatterplot used for?

Back

A scatterplot is used to display the relationship between two quantitative variables, showing how much one variable is affected by another.

Front

What is a histogram?

Back

A histogram is a graphical representation of the distribution of numerical data, showing the frequency of data points within specified ranges (bins).

Front

What is the difference between a segmented bar graph and a dot plot?

Back

A segmented bar graph shows the proportion of categories within groups, while a dot plot displays individual data points, making it easier to see the distribution and frequency of values.