Lesson 5

Describing Trends in Scatter Plots

Let’s look for associations between variables.

Problem 1

  1. Draw a line that you think is a good fit for this data. For this data, the inputs are the horizontal values, and the outputs are the vertical values.
    Scatterplot. Horizontal, from 0 to 20, by 5’s. Vertical, from 0 to 60, by 15’s. 14 data points. Trend downward and to right.

  2. Use your line of fit to estimate what you would expect the output value to be when the input is 10.

Problem 2

Here is a scatter plot that shows the most popular videos in a 10-year span.

A scatterplot, x, date, January 1 2007 to January 1 2019 by 2 years, y, views, billions. Points range from y = point 8, to 2 point 8 with no discernable pattern.
  1. Use the scatter plot to estimate the number of views for the most popular video in this 10-year span.
  2. Estimate when the 4th most popular video was released.
(From Unit 6, Lesson 3.)

Problem 3

A recipe for bread calls for 1 teaspoon of yeast for every 2 cups of flour.

  1. Name two quantities in this situation that are in a functional relationship.

  2. Write an equation that represents the function.

  3. Draw the graph of the function. Label at least two points with input-output pairs.

(From Unit 5, Lesson 8.)