Question

what is the purpose of drawing a line of best fit?
a. to show the overall trend in the data
b. to connect all the data points
c. to show the highest data point
d. to indicate the range of the data
why are scatter plots useful?
a. they display the frequency of each value
b. they help visualize relationships between two variables
c. they calculate the average value
d. they show the median of a dataset

Explanation:

• For the first question: A line of best fit is used to show the overall trend in the data. It is not meant to connect all data points (as data may have scatter), not to show the highest data point (that's just one data value), and not to indicate the range (range is max - min of a variable).
• For the second question: Scatter plots are useful because they help visualize relationships between two variables. Frequency of each value is shown in histograms (for one variable) or frequency tables. Calculating the average value is a statistical calculation (not a visual display purpose). Showing the median is also a statistical measure (not the role of a scatter - plot for visualizing relationships).

Answer:

1. a. To show the overall trend in the data
2. b. They help visualize relationships between two variables