Bivariate Data

What type of association does this graph have?

• positive
• negative
• none
• all of the above

Which scatter plot could have a trend line whose equation is y hat= 3x + 10?

• A

• B

• C

• D

What kind of trend is shown from this scatterplot?

• positive correlation
• negative correlation
• none
• cannot be determind

Which scatter plot shows a linear relationship between x and y?

• Graph A
• Graph B
• Graph C
• Graph D

The equation of the trend line

is y hat= 1/2x +1. What does the x variable represent?

• The number of laps

• The amount of time in hours

• The amount of time in minutes

• How long it takes to go 0 laps

What is a line of best fit used for?

• To make predictions
• To make the graph look pretty
• To connect the points
• To make it look like you know what you are doing

Describe the correlation in the graph shown.

• Strong Negative
• Strong Positive
• Weak Negative
• Weak Positive

A baseball coach graphs some data and finds the line of best fit. The equation for the line of best fit is

y hat= 0.32x - 20.51, where x is the number of times at bat and y is the number of hits.

How many hits should be expected from a player who is at bat 175 times?

• 35 hits

• 49 hits

• 609 hits

• 62 hits

Joe tracked the height of his Dalmatian puppy from age 13 weeks to 25 weeks. He graphed the data and determined the line of best fit is y hat= 1.12x + 28.78. What does the slope represent in this situation?

• The puppy weighed 28.78 pounds at age 13.

• For every week that goes by, the puppy gains 1.12 pounds.

• The puppy gains a pound every 1.12 weeks.

• The puppy weighs 1.12 pounds when it was born.

A veterinarian student tracks the weight of a kitten, in ounces, from the age of 0 to 32 weeks. She graphs the data and determines the line of best fit is y hat = 4.03x + 3.27. What does the y-intercept represent in this situation?

• The kitten weighs 3.27 ounces when it's born.

• The kitten weighs 4.03 ounces when it's born.

• The kitten gains 3.27 ounces a week.

• The kitten gains 4.03 ounces a week.