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Quiz In Class

Title: Two-Variable Data

Grade Lesson s4-l2

Explanation: Hello Students, time to practice and review. Let us take next 10-15 minutes to solve the ten problems using the Quiz Sheet. Then submit the quiz to get the score. This is a good exercise to check your understanding of the concepts.

Quiz: in Class

Id	Name	Note
1	Of the following, which is the best model for the data in the scatterplot? $1$	A) y = \$2 \times x^2 - 11x - 20\$ B) y = \$2 \times x^2 - 5x - 3\$ C) y = \$2 \times x^2 - 11x + 20\$ D) y = \$2 \times x^2 - 5x + 3\$
2	In an experiment, a heated cup of coffee is removed from a heat source, and the cup of coffee is then left in a room that is kept at a constant temperature. The graph above shows the temperature, in degrees Fahrenheit (°F), of the coffee immediately after being removed from the heat source and at 10-minute intervals thereafter. During which of the following 10-minute intervals does the temperature of the coffee decrease at the greatest average rate? $2$	A) Between 0 and 10 minutes B) Between 30 and 40 minutes C) Between 50 and 60 minutes D) Between 90 and 100 minutes
3	The scatterplot shows the relationship between two variables, x and y. A line of best fit for the data is also shown. $3$ At x = 25.5, which of the following is closest to the y-value predicted by the line of best fit?	A) 6.20 B) 7.30 C) 9.10 D) 8.20
4	The scatterplot shows the relationship between two variables x, and y. A line of best fit is also shown. $4$ Which of the following is closest to the slope of the line of best fit shown?	A) 2 B) -1 C) -2 D) 1
5	The scatterplot shows the relationship between two variables, x and y. A line of best fit for the data is also shown. $5$ At x = 32 , which of the following is closest to the y-value predicted by the line of best fit?	A) 2.4 B) 1.5 C) 0.4 D) 3.3
6	Which of the following could be the equation for a line of best fit for the data shown in the scatterplot above? $6$	A) y = -0.8x + 3 B) y = 3x + 0.8 C) y = 0.8x + 3 D) y = -3x + 0.8
7	Find the value of variables which satisfies the following equation: 2x + 5y = 20 and 3x + 6y = 12.	A) x = 20 B) x = -23 C) x = -20 D) x = 25
8	The scatterplot above shows the number of visitors to a railroad museum in Pennsylvania each year from 1968 to 1980, where t is the number of years since 1968 and n is the number of visitors. A line of best fit is also shown. Which of the following could be an equation of the line of best fit shown? $8$	A) n = 9060 + 16060t B) n = 4690 + 16090t C) n = 16090 + 9060t D) n = 16090 + 4680t
9	Suppose you have the following data representing the number of hours studied(x) and the corresponding test scores(y) for the group of students. $9$ Calculate the correlation coefficient between the number of hours studied and the test scores.	A) 1 B) 2.36 C) 3 D) 1.36
10	The scatterplot above shows the size x and the sale price y of 25 houses for sale in Town H. Which of the following could be an equation for a line of best fit for the data? $10$	A) y = 200x + 100 B) y = 100x + 100 C) y = 50x + 100 D) y = 100x

Name

Note

Of the following, which is the best model for the data in the scatterplot?

$1$

A) y = \$2 \times x^2 - 11x - 20\$

B) y = \$2 \times x^2 - 5x - 3\$

C) y = \$2 \times x^2 - 11x + 20\$

D) y = \$2 \times x^2 - 5x + 3\$

In an experiment, a heated cup of coffee is removed from a heat source, and the cup of coffee is then left in a room that is kept at a constant temperature. The graph above shows the temperature, in degrees Fahrenheit (°F), of the coffee immediately after being removed from the heat source and at 10-minute intervals thereafter. During which of the following 10-minute intervals does the temperature of the coffee decrease at the greatest average rate?

$2$

A) Between 0 and 10 minutes

B) Between 30 and 40 minutes

C) Between 50 and 60 minutes

D) Between 90 and 100 minutes

The scatterplot shows the relationship between two variables, x and y. A line of best fit for the data is also shown.

$3$

At x = 25.5, which of the following is closest to the y-value predicted by the line of best fit?

A) 6.20

B) 7.30

C) 9.10

D) 8.20

The scatterplot shows the relationship between two variables x, and y. A line of best fit is also shown.

$4$

Which of the following is closest to the slope of the line of best fit shown?

A) 2

B) -1

C) -2

D) 1

The scatterplot shows the relationship between two variables, x and y. A line of best fit for the data is also shown.

$5$

At x = 32 , which of the following is closest to the y-value predicted by the line of best fit?

A) 2.4

B) 1.5

C) 0.4

D) 3.3

Which of the following could be the equation for a line of best fit for the data shown in the scatterplot above?

$6$

A) y = -0.8x + 3

B) y = 3x + 0.8

C) y = 0.8x + 3

D) y = -3x + 0.8

Find the value of variables which satisfies the following equation:

2x + 5y = 20 and 3x + 6y = 12.

A) x = 20

B) x = -23

C) x = -20

D) x = 25

The scatterplot above shows the number of visitors to a railroad museum in Pennsylvania each year from 1968 to 1980, where t is the number of years since 1968 and n is the number of visitors. A line of best fit is also shown. Which of the following could be an equation of the line of best fit shown?

$8$

A) n = 9060 + 16060t

B) n = 4690 + 16090t

C) n = 16090 + 9060t

D) n = 16090 + 4680t

Suppose you have the following data representing the number of hours studied(x) and the corresponding test scores(y) for the group of students.

$9$

Calculate the correlation coefficient between the number of hours studied and the test scores.

A) 1

B) 2.36

C) 3

D) 1.36

The scatterplot above shows the size x and the sale price y of 25 houses for sale in Town H. Which of the following could be an equation for a line of best fit for the data?

$10$

A) y = 200x + 100

B) y = 100x + 100

C) y = 50x + 100

D) y = 100x