Statistics and Probability

If a line of best fit models data very well, what would you expect to see in a graph of the data and the line?

• The line has a positive slope.

• The line has a negative slope.

• The line is very close to all of the points.

• The line is close to some of the points but not very close to the other points.

Which statement correctly describes the association between temperature and number of hikers that reached the overlook?

• The association is positive but not linear.

• The association is negative but not linear.

• The association is linear because it is negative.

• The association is neither positive nor negative because it is not linear.

The graphs of which the following relationships would demonstrate a positive association between variables? Select all that apply.

• Outside temperature and cost to heat a home

• Number of people in a grocery check-out line and how long you have to wait to check out

• Length of time you have walked and distance you have traveled

• Pounds of cherries you buy and amount of money you spend on cherries

• Speed of train and the amount of money you spend on cherries

Line k is the line of best fit for a set of data on scatter plot. The data show a strong linear association. Which scatter plot best represents these data and line k?

• 
• 
• 
• 

The scatter plots below both show the year and price for the same 17 used cars. However, each scatter plot shows a different model for the relationship between year and price.

Which model does a better job of predicting the price of a used car from its year?

• Model A

• Model B

• Both A and B

• The models cannot be used to predict the price of a used car from its year.

Which of these most closely approximates a line of best fit for the data in the scatter plot?

• 
• 
• 
• 

What is the mean of the following list of numbers?

• 9

• 10

• 11.5

• 12.5

What is the median of the following list of numbers?

• 9

• 11

• 10

• 12

The following M & M colors are in the bowl:
4 yellow, 6 orange, 3 green, 5 blue, 2 brown
What is the probability of selecting a brown candy?

• 2/18

• 1/9

• 2/20

• 1/10

What is the range of the dot plot?

• 9

• 5

• 4

• 6