Scatterplots (Quiz)

The table below shows the approximate percent of students who sent applications to two colleges in various years since 1985. How well does the line fit the data? a. Except for (6, 15), the line fits the data fairly well. b. The line fits the data fairly well. c. The line does not fit the data. d. There is not enough information to tell if the line fits the data well.

A

Choose the correct statement about best-fit lines. a. A best-fit line is close to most of the data points. b. A best-fit line describes the exact coordinates of each point in the data set. c. A best-fit line always has a positive slope. d. A best-fit line must go through at least two of the data points.

A

The table below shows the amount of money spent on skin diving and scuba equipment in some recent years. Use the regression equation to predict the sales of skin diving and scuba equipment in the year 2008. a. 44,000,000 b. 440,000,000 c. 42,455,000 d. 424,550,000

D

The following is a scatter plot of the heights and weights of the students in Mr. Baldwin's PE class. Given the line of best fit, estimate the height of a student who weighs 146 pounds. a. About 67.5 inches b. About 65 inches c. About 72 inches d. About 72.5 inches

A. About 67.5 Inches

A line that is used to represent the linear trend in the data is called the line of best fit. When finding the error of the line of best fit, which statement holds true? a. If the error is less than one, the line of best fit is the linear equation of the data. b. The smaller the error, the better the fit. c. If the error is greater than one, there is no correlation to the line of best fit. d. The larger the error, the better the fit.

B

The scatter plot shows the number of milk cow operations in New Mexico from 1975 to 1995. Write an equation for the line of best fit. Then predict the number of milk cow operations in the year 2005. a. y=-5x+1900; about 1885 milk cow operations in the year 2005 b. y=-50x+1900; about 400 milk cow operations in the year 2005 c. y=-50x-100; about 1400 milk cow operations in the year 2005 d. y=-5x-100; about 250 milk cow operations in the year 2005

B

The table below shows the approximate percentage of students who sent applications to two colleges in various years since 1985. What do the slope and y-intercept indicate? A. The slope indicates that the percent in 1985 should have been about 19%. The y-intercept indicates that the percent is falling at about 0.4% each year. B. The slope indicates that the percent is falling at about 0.4% each year. The y-intercept indicates the percent in 1985 should have been about 19%. C. The slope indicates that the percent has remained the same for each year. The y-intercept indicates the percent in 1985 should have been 22%. D. There is not enough information to determine what the slope and y-intercept indicate.

B

The table below shows the average SAT math scores from 1993-2002. Using the data from the table, choose which set of axes and which set of ordered pairs you would use to plot the data. Set A (1993, 503), (1994, 504), (1995, 506), (1996, 508), (1997, 511), (1998, 512), (1999, 511), (2000, 514) Set B (503, 1993), (504, 1994), (506, 1995), (508, 1996), (511, 1997), (512, 1998), (511, 1999), (514, 2000) A. Graph B, Set A B. Graph B, Set B C. Graph A, Set A D. Graph A, Set B

B

The table below shows the average SAT math scores from 1993-2002. Using the data from the table determine if there is a linear trend between the year and the average SAT math scores and determine if there is an exact linear fit of the data. Describe the linear trend if there is one.

B

The table below gives a record of the funds raised by a TV station since its first year of operations. Draw a scatter plot for the data.

C

The table below shows the scoring averages for the players on the Supersonics intramural basketball team last season. Using the data from the table, choose which set of axes and which set of ordered pairs you would use to plot the data. Set A (19, 2), (14, 8), (16, 6), (18, 10), (15, 12), (10, 15.5), (17, 6), (11, 4), (14, 2) Set B (2, 19), (8, 14), (6, 16), (10, 18), (12, 15), (15.5, 10), (6, 17), (4, 11), (2, 14) a. Graph B, Set A b. Graph B, Set B c. Graph A, Set A d. Graph A, Set B

C

The following table shows the appraised value of a house over time. Using the data from the table, choose which set of axes and which set of ordered pairs you would use to plot the data. Set A (140, 0), (148, 3), (160, 6), (162, 9), (185, 12), (178, 15), (194, 18) Set B (0, 140), (3, 148), (6, 160), (9, 162), (12, 185), (15, 178), (18, 194) a. Graph A, Set A b. Graph B, Set A c. Graph A, Set B d. Graph B, Set B

C. Graph A, Set B