Exploring Scatterplots and Linear Regression

What type of data is required to create a scatter plot?

• Quantitative data

• Qualitative data

• Categorical data

• Descriptive data

Why can't a scatter plot be used to compare hair color to eye color?

• Because they are both qualitative data

• Because they are both numerical data

• Because they are both quantitative data

• Because they are both categorical data

What does a positive correlation in a scatter plot indicate?

• As x increases, y decreases

• As x increases, y remains constant

• As x increases, y increases

• As x decreases, y increases

What does it mean if the points in a scatter plot are all over the place?

• Strong correlation

• No correlation

• Negative correlation

• Positive correlation

Which tool is recommended for creating scatter plots in the tutorial?

• Excel

• Google Sheets

• Desmos

• Python

What is the purpose of adjusting the window in Desmos when creating a scatter plot?

• To change the data values

• To zoom in and out for a better view

• To change the color of the points

• To add more data points

What is a residual in the context of a line of best fit?

• The difference between the observed and predicted y values

• The sum of all y values

• The product of the slope and y-intercept

• The average of all x values

What does an r value of 0 indicate?

• Perfect correlation

• No correlation

• Strong negative correlation

• Strong positive correlation

What is the term for using a line of best fit to predict values within the range of the data set?

• Interpolation

• Correlation

• Extrapolation

• Regression

Why is it unreliable to use a line of best fit to predict values outside the range of the data set?

• Because it increases the correlation

• Because it leads to inaccurate answers

• Because it decreases the slope

• Because it changes the y-intercept