Bivariate Data

What is the equation of the trend line?

A city manager made a scatter plot of the number of retail stores in the city over the years. A scatter plot had a trend line with an equation of y=11x+12, where y is the total number of retail stores and x is the number of years since 1990.

Use the equation to predict the number of retail stores in the city in 1997. (7 years later).

• 89

• 77

• 7

• 98

Several schools reported the number of students who received a flu vaccine in a year and the number of cases of the flu amongst their students that year. A scatter plot was made with a trend line that had an equation of y=-\frac{1}{4}x+85. Use the equation to predict the number of cases of the flu that would occur if 300 students received he flu vaccine.

• 75

• 160

• 300

• 10

A scatter plot was created to show the length of a person's vacation and the weight of the suitcase they packed. The equation of the trend line is y=5x+15, where x represents the length of the trip.

Use the equation to predict the weight of a suitcase for someone taking a 9-day trip.

• 45

• 60

• 15

• 55

The scatter plot shows the relationship between the number of chapters and the total number of pages for several books.  Use the trend line to predict how many chapters would be in a book with 180 pages. 

• 12 chapters

• 15 chapters

• 18 chapters

• 21 chapters

The equation of the trend line
is  y= 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

If the debate team plans to practice for 6 hours, how many debates should they win?

• 20

• 16

• 24

• 28

Q1. What is the total number of items?

• 560

• 295

• 760

• 855

Use the two-way frequency table to complete the relative frequency table. Find the value of variable A.

• 27

• 37

• 64

• 21

What percentage of males drive sports cars?

• 35%

• 16.25%

• 65%

• 25%