Gr. 8 OPR Unit 6 Review

The scatter plot shows the number of hits and home runs for 20 baseball players who had at least 10 hits last season. The table shows the values for 15 of those players.

The model, represented by y=0.15x - 1.5 , is graphed with a scatter plot.

Player A had 154 hits in 2015. How many home runs did he have?

• 11

• 16

• 3

• 26

Data was gathered to see if there was an association with skateboard enjoyment and snowmobile enjoyment. There is no evidence of association. What could be the missing number? (Think proportions)

• 45 + 25 + 10 =80, so 80

• 25/10 = 2.5, so 2.5 x 45=112.5, so 113

• 10/25= 0.4, so .40 x 45 = 18, so 18

• 25-10=15, so 15

Here is a scatter plot that compares points per game to free throw attempts per game for basketball players in a tournament. Which coordinate point best represents an outlier?

• (3.1, 10)

• (1.9, 19)

• (1.8, 5.5)

• (5.3, 29)

The linear model for some butterfly data is given by the equation y=0.238x + 4.642. Which of the following best describes the slope of the model?

• For every 1 mm the wingspan increases, the length of the butterfly increases 0.238 mm.

• For every 1 mm the wingspan increases, the length of the butterfly increases 4.642 mm.

• For every 1 mm the length of the butterfly increases, the wingspan increases 0.238 mm.

• For every 1 mm the length of the butterfly increases, the wingspan increases 4.642 mm.

Describe the relationship between the number of at bats and the number of hits using the data in the scatter plot.

• As the number of hits decreases, the number of bats increase.

• As the number of hits increase, the number of bats increases.

• As the number of bats decrease, so do the number of hits.

• As the number of bats increase, the number of hits increases.

Here is a scatter plot that shows the years when some used cars were made and their prices in 2016, together with the graph of a linear model for the relationship between year and price.

Which of these values is closest to the slope of the linear model shown in the scatter plot?

• 1,000

• 3,000

• -1,000

• -3,000

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?

• Yes, the relative frequencies of the animals drinking each color of water are the same, so they must be associated.

• No, the relative frequencies of the animals drinking each color of water are about the same, so there is no evidence of association.

• No, the frequencies are hard to tell

• Yes, the frequencies are easy to tell

What is the relative frequencies for the bought lettuce row?

• under bought apples 64% did not buy apples 67%

• under bought apples 19% did not buy apples 81%

• under bought apples 81% did not buy apples 19%

• under bought apples 67% did not buy apples 64%

Workers at an advertising agency are interested in people’s TV viewing habits. They take a survey of people in two cities to try to find patterns in the types of shows they watch. The results are recorded in a table and shown in a segmented bar graph. Is there evidence of different viewing habits?

• Yes, there are differences Chicago watches more news and drama than Topekans. Topekans watch more reality by a lot.

• No, there are no real differences. They all watch tv.

• Yes, there are differences. Topekans watch news and dramas much more than Chicagoans. Chicagoans watch comedies much more. They watch about the same amount of reality TV.

• Yes, there are differences. Topekians watch more reality and news. While Chicagoans watch more Comedy and drama.

Which graph has a scatter plot that shows a negative, linear association and has one clear outlier?

• a

• b

• c

• d