Unit 3 Test 96%

Which two points should the line of best fit go through to best represent the data in the scatterplot? On a graph, points are at (1, 16), (2, 15), (3, 14), (4, 9), (5, 8), and (6, 1). (1, 16) and (2, 15) (1, 16) and (6, 1) (2, 15) and (4, 9) (5, 8) and (6, 1)

(2, 15) and (4, 9)

The table shows the number of hours spent studying for a history final exam and the score on that exam. Each row represents a single student. Which value is an outlier in the table below?Exam ScoresNumber of hours spent studying, xExam score(out of 100), y1.5652683.5714.5984.5826846.588785780 (1.5, 65) (3.5, 71) (4.5, 98) (6.5, 88)

(4.5, 98)

The table below shows a set of data. Which of the following points, if added to the table, would be an outlier? (7, 73) (7.5, 70) (8, 35) (8.5, 66)

(8, 35)

A clothing store experimented with the price of blue jeans to see if the price affects the number of pairs sold. The results are shown in the table. What is the approximate slope of the line of best fit given by a regression calculator? A calculator screen. A 2-column table with 6 rows titled Data. Column 1 is labeled x with entries 18, 23, 25, 29, 30, 33. Column 2 is labeled y with entries 16, 13, 10, 8, 6, 2. The linear regression equation is y almost-equals negative 0.905 x + 32.998; r almost-equals negative 0.983. -0.98 -0.91 0.91 0.98

-0.91

Darren is finding the equation in the form for a trend line that passes through the points (2, 18) and (-3, 8). Which value should he use as b in his equation? -34 -19 2 14

14

What is the slope of a trend line that passes through the points (1, 3) and (10, 25)?

22/9

Steven created the scatterplot and trend line below to model the relationship between the number of innings he pitched and the number of pitches he threw in a baseball game. Baseball PitchesIf Steven threw 87 pitches, about how many innings did he pitch? 5 6 7 cannot be determined; number of pitches is outside graph

7

Alya claims that the scatterplot shows a linear correlation. Enrique claims that the scatterplot has no correlation.Which statement about their claims is true? Alya is correct because the scatterplot clusters about a line with a slope of zero. Alya is correct because as the x-values increase, the y-values remain the same. Enrique is correct because the scatterplot clusters about a curve. Enrique is correct because as the x-values increase, the change has no effect on the y-values.

Alya is correct because the scatterplot clusters about a line with a slope of zero.

The scatterplot below shows the number of weeks that students have been in keyboarding class and the number of mistakes that they made on a keyboarding test.Which statement about the scatterplot is true? As the number of weeks in class increases, the number of keyboarding mistakes decreases. As the number of weeks in class increases, the number of keyboarding mistakes increases. Regardless of the number of weeks in class, the number of keyboarding mistakes does not change. In general, decreased keyboarding mistakes do not affect the number of weeks in class.

As the number of weeks in class increases, the number of keyboarding mistakes decreases.

Peter attempted to use the divide-center method to find the line of best fit on a scatterplot.What was his mistake? He had a different number of points to the left of the vertical line than to the right of the vertical line. He had a different number of points above the line of best fit than below the line of best fit. He didn't approximate the center of the cluster located on the left side of the vertical line and of the cluster located on the right side of the vertical line. He didn't connect the centers of the clusters on the left side and right side of the vertical line to produce the line of best fit.

He had a different number of points to the left of the vertical line than to the right of the vertical line.

Jordan is calculating the slope of the trend line in the scatterplot below.How can Jordan use the plot to check the reasonableness of his answer? His slope should be positive because the coordinates of all the plotted points are positive. His slope should be positive because the trend line is slanted up to the right. His slope should be negative because there are plotted points not on the line. His slope should be negative because the x-coordinate of each plotted point is less than the y-coordinate.

His slope should be positive because the trend line is slanted up to the right.

Hugo recorded the height of each plant after he exposed each plant to a set amount of sunlight daily. The scatterplot shows his results after 2 weeks of exposing each plant to a set amount of sunlight.Which statement about the outlier in the data set is true? Hugo should not include the outlier because it lessens the effect of showing that sunlight helps plants grow. Hugo should include the outlier because it shows there is no relationship between hours of sunlight and plant height. Hugo should not include the outlier because it strengthens the effect of showing that sunlight helps plants grow. Hugo should include the outlier because it shows there is a relationship between hours of sunlight and the height of the plant.

Hugo should not include the outlier because it lessens the effect of showing that sunlight helps plants grow.

Which pair of points should be used to find the line of best-fit for the scatterplot?. J and L J and M K and L K and M

K and M

Which statement is correct when a scatterplot is constructed? The independent variable is the input variable and should be represented by the x-axis. The independent variable is the input variable and should be represented by the y-axis. The dependent variable is the input variable and should be represented by the x-axis. The dependent variable is the input variable and should be represented by the y-axis.

The independent variable is the input variable and should be represented by the x-axis.

According to the scatterplot below, which statement is correct? The input, or dependent variable, is enrollment. The output, or dependent variable, is years in operation. The input, or independent variable, is years in operation. The output, or independent variable, is enrollment.

The input, or independent variable, is years in operation.

James needs to draw the trend line for both scatterplot A and scatterplot B.Scatterplot AScatterplot BWhich of these statements is correct? The trend line for scatterplot A will have a positive slope, and the trend line for scatterplot B will have a positive slope. The trend line for scatterplot A will have a positive slope, and the trend line for scatterplot B will have a negative slope. The trend line for scatterplot A will have a negative slope, and the trend line for scatterplot B will have a positive slope. The trend line for scatterplot A will have a negative slope, and the trend line for scatterplot B will have a negative slope.

The trend line for scatterplot A will have a negative slope, and the trend line for scatterplot B will have a positive slope.

Which describes the correlation shown in the scatterplot? There is a positive correlation in the data set. There is a negative correlation in the data set. There is no correlation in the data set. More points are needed to determine the correlation.

There is a negative correlation in the data set.

Serena says that if a regression line is drawn correctly in a scatterplot, there will always be the same number of points above the line as there are below the line. Which of these must be a counterexample to her claim? a scatterplot with an odd number of points in which the correct regression line passes directly through 0 of the points a scatterplot with an even number of points in which the correct regression line passes directly through 0 of the points a scatterplot with an odd number of points in which the correct regression line passes directly through 1 of the points a scatterplot with an even number of points in which the correct regression line passes directly through 2 of the points

a scatterplot with an odd number of points in which the correct regression line passes directly through 0 of the points

For the data that are shown on the graph below, within which range of x values can interpolation occur? between 1 and 10 between 0 and 55 between 5 and 55 between 25 and 50

between 25 and 50

Which scatterplot shows no correlation?

d

Which scatterplot shows the strongest negative linear association?

d

What type of association and correlation are shown by the scatterplot? linear association, positive correlation linear association, negative correlation nonlinear association, strong correlation nonlinear association, weak correlation

linear association, positive correlation

Jeremy surveyed students in his class about their spending habits in the school cafeteria. He used the data to create a scatterplot. How Students Spend Money in the CafeteriaWhich is the equation of his trend line?

y=3.25x-1

What is the equation of the line of best fit given by a regression calculator for the data in the table?

y=5.10x+9.12

The enrollment at East Valley High School over a six-year period is displayed in the scatterplot.Student Enrollment at East Valley High School Which is the equation of the line of best-fit for this scatterplot?

y=81/2x-160.069/2