Bivariate Univariate

p. 46 Item #20 - What is the MOST likely correlation coefficient, r, between the variables represented in this scatter plot?

• -0.9

• -0.5

• 0.5

• 0.9

p. 49 #9. This table shows the average low temperature, in ºF,recorded in Macon, GA, and Charlotte, NC, over a six-day period.

• The interquartile range of the temperatures is the same for both cities.

• The lower quartile for the temperatures in Macon is lower than the lower quartile for the temperatures in Charlotte.

• The mean and median temperatures of Macon were higher than the mean and median temperatures of Charlotte.

• The upper quartile for the temperatures in Charlotte was lower than the upper quartile for the temperatures in Macon.

p. 50 #11. A reading teacher recorded the number of pages read in an hour by each of her students. The numbers are shown below.

44, 49, 39, 43, 50, 44, 45, 49, 51

For this data, which summary statistic is NOT correct?

• The minimum is 39

• The lower quartile is 44.

• The median is 45.

• The maximum is 51.

p. 51 #13. Peter went bowling, Monday to Friday, two weeks in a row. He only bowled one game each time he went. He kept track of his scores below.

Week 1: 70, 70, 70, 73, 75

Week 2: 72, 64, 73, 73, 75

What is the BEST explanation of why Peter’s Week 2 mean score was lower than his Week 1 mean score?

• Peter received the same score three times in Week 1.

• Peter had one very low score in Week 2.

• Peter did not beat his high score from Week 1 in Week 2.

• Peter had one very high score in Week 1.

p. 45 # 8:

Item #8 - This list shows the number of text messages each student in a group sent in one day.

16, 2, 8, 5, 3, 20, 15, 4, 9, 16, 19, 17

The students are creating this histogram to show their data.

What should be the height of the bar for 6–10 text messages?

• 1

• 2

• 4

• 5

(p. 46 #19)

Item #19 A train traveled from Chicago to Los Angeles. The points graphed on this coordinate grid show the distance the train was from Los Angeles after each of the first eight hours of the trip.

The linear regression model for the data is d(t)=−58t+1888. Based on the regression function, which is the best estimate for the total time it took the train to travel the entire distance?

• 10 hours

• 33 hours

• 53 hours

• 63 hours

Tags

CCSS.HSF.LE.B.5

p. 47 #5. Josh and Richard each earn tips at their part-time job. This table shows their earnings from tips for five days.

What is the difference in the interquartile range for Josh’s earnings from tips and Richard’s earnings from tips?

• 1

• 14

• 15

• 3

p. 55 #26: This graph plots the number of wins in the 2006 and 2007 seasons for a sample of professional football teams.

Which equation BEST represents a line that matches the trend of this data?

• y = x + 2

• y = x + 7

• y = 3/5x + 1

• y = 3/5x + 5

p. 58 #34. Which BEST describes the correlation of the two variables shown in the scatter plot?

• weak positive

• strong positive

• weak negative

• strong negative

p. 58 #35. Which of these statements is an example of causation?

• When the weather becomes warmer, more meat is purchased at the supermarket.

• More people go to the mall when students go back to school.

• The greater the number of new television shows, the fewer the number of moviegoers.

• After operating costs are paid at a toy shop, as more toys are sold, more money is made.