Unit 5: Statistics Practice

Two students observed the association shown on the scatter plot.

Choose the name of the student who made the correct statement.

• Archie says the scatter plot shows positive linear association.

• Autumn says the scatter plot shows positive non-linear association.

Choose the name of the student who made the correct statement.

• Bernard says scatter plots B and C contain outliers in their data points.

• Beatrice says scatter plots A and D contain outliers in their data points.

The table shows the weight of a package and the cost of shipping the package.

Choose the name of the student who made the correct statement.

• Charlie says the association is positive because as the weight increases, the price increases.

• Charlotte says the association is negative because as the weight decreases, the cost decreases.

A trend line was created to show the overall pattern of the scatter plot.

Choose the name of the student who made the correct statement.

• Douglas says the equation of the trend line is y = 10x + 30.

• Debbie says the equation of the trend line is y = 5x + 30.

Several people's ages and the number of speeding tickets they have received is shown on the scatter plot.

Choose the name of the student who made the correct statement.

• Edmond says based on the trend line, he would predict a 75 year old to have received 7 tickets.

• Ellie says based on the trend line, she would predict a 75 year old to have received 9 tickets.

A principal made a scatter plot of the number of students in his school who own a cell phone compared to the year.

The trend line has an equation of y = 25x + 121 where y is the number of students who own cell phones, and x is the number of years since 2010.

Choose the name of the student who made the correct statement.

• Frankie says that in 2016, he would predict 271 students to own cell phones.

• Florence says that in 2016, she would predict 521 students to own cell phones.

The scatter plot shows the number of years of experience of 8 different wedding photographers and the number of weddings they photographed over the last year. Based on the scatter plot, what would be the best predication of the number of weddings that a photographer with 7 years of experience would photograph in a year?

• 41

• 57

• 68

• 75

The scatter plot shows different people’s ages and the number of states they have visited. Based on the equation of the trend line shown, how many states would you predict someone who is 50 years old has visited?

• 12 states

• 22 states

• 18 states

• 15 states

Which best describes the main difference between scatter plots X and Y?

• X shows clustering while Y does not show clustering.

• X is non-linear while Y is linear.

• X shows negative association while Y shows positive association.

• X contains an outlier while Y does not contain any outliers.

A scatter plot was created to show the relationship

between the number of staff members and students

at various schools. The scatter plot’s trend line has an

equation of y = 0.1x + 18, where y is the total number

of staff members and x is the total number of

students.

Use the equation to predict the number of students in

a school with 120 staff members.

• 1,038 students

• 30 students

• 890 students

• 1,020 students