Drawing Trend Lines on Scatter Plots

The video tutorial explains scatter plots as a tool for comparing two sets of numbers to identify relationships. It uses two examples: an ice cream shop analyzing the relationship between temperature and customer count, and a student analyzing study time versus spelling test performance. The video demonstrates how to plot data points, draw trend lines, and interpret positive and negative associations. The ice cream shop example shows a positive association, while the spelling test example shows a negative association. The tutorial concludes with a summary of how to read scatter plots and use trend lines for data interpretation.

What is the primary purpose of a scatter plot?

• To compare two different sets of numbers and identify relationships.

• To display data in a bar chart format.

• To calculate the mean of a data set.

• To list data points in a table.

In the ice cream shop example, what two variables are being compared?

• Daily sales and weekly sales.

• Number of ice cream flavors and customer satisfaction.

• Outside temperature and number of customers.

• Number of customers and sales revenue.

What is the purpose of a trend line in a scatter plot?

• To replace the data points with a single value.

• To connect all the data points.

• To highlight the highest and lowest points.

• To show the general direction or pattern of the data.

How should a trend line be positioned in relation to the data points?

• Below all the data points.

• Above all the data points.

• To the left of all the data points.

• Through the middle, with roughly half the points above and half below.

What does a positive slope in a trend line indicate?

• As one variable increases, the other also increases.

• As one variable increases, the other decreases.

• The data points are evenly distributed.

• There is no relationship between the variables.

In the student study time example, what is being compared?

• Study time and number of words spelled correctly.

• Study time and number of words spelled incorrectly.

• Study time and overall test score.

• Study time and number of tests taken.

What does a negative slope in a trend line indicate?

• As one variable increases, the other also increases.

• There is no relationship between the variables.

• As one variable increases, the other decreases.

• The data points are clustered together.

What was the trend observed in the ice cream shop example?

• No association between temperature and customers.

• Negative association between temperature and customers.

• Inverse association between temperature and customers.

• Positive association between temperature and customers.

What was the trend observed in the student study time example?

• Positive association between study time and words wrong.

• Negative association between study time and words wrong.

• No association between study time and words wrong.

• Inverse association between study time and words wrong.

What is the key difference between the two examples discussed?

• One shows no association, the other a positive association.

• Both show negative associations.

• Both show positive associations.

• One shows a positive association, the other a negative association.