Lesson 23: Practice Problems

Problem 1

A scientist wants to know if the color of the water affects how much animals drink. The average amount of water each animal drinks was recorded in milliliters for a week and then graphed. Is there evidence to suggest an association between water color and animal?

cat intake (ml)

dog intake (ml)

total (ml)

blue water

green water

total

A bar graph of blue water vs green water and cat vs dog

Problem 2

A farmer brings his produce to the farmer’s market and records whether people buy lettuce, apples, both, or something else.

Make a table that shows the relative frequencies for each row. Use this table to decide if there is an association between buying lettuce and buying apples.

bought apples

did not buy apples

bought lettuce

did not buy lettuce

Problem 3

Researchers at a media company want to study news-reading habits among different age groups. They tracked print and online subscription data and made a 2-way table.

internet articles

print articles

18–25 year olds

26–45 year olds

45–65 year olds

  1. Create a segmented bar graph using one bar for each row of the table.

  2. Is there an association between age groups and the method they use to read articles? Explain your reasoning.

Problem 4 From Unit 5 Lesson 21

Using the data in the scatter plot, what is a reasonable slope of a model that fits this data?

A scatter plot of data with a generally positive correlation
  1. -2.5

  2. -1

  3. 1

  4. 2.5