Pretest

Question 1

Which table shows a negative correlation?

Revolt · Accepted Answer

Table with 2 columns and 7 rows.Row 1: Column 1, 'x'; Column 2, 'y' Row 2: Column 1, '2'; Column 2, '4' Row 3: Column 1, '5'; Column 2, '2' Row 4: Column 1, '6'; Column 2, 'negative 4' Row 5: Column 1, '7'; Column 2, 'negative 3' Row 6: Column 1, '10'; Column 2, 'negative 11' Row 7: Column 1, '12'; Column 2, 'negative 12'

Question 2

About how many blocks are there per pound? Round to the nearest block.

Revolt · Accepted Answer

20

Question 3

What is the correlation between age and weight as shown in the table?

Revolt · Accepted Answer

positive

Question 4

What is the correlation between the weight and price of a box of cereal?

Revolt · Accepted Answer

positive

Question 5

Darius is studying the relationship between mathematics and art. He asks friends to each draw a "typical” rectangle. He measures the length and width in centimeters of each rectangle and plots the points on a graph, where x represents the width and y represents the length. The points representing the rectangles are 6 point 1 comma 12 point 0 , 5 point 0 comma 8 point 1 , 9 point 1 comma 15 point 2 , 6 point 5 comma 10 point 2 , 7 point 4 comma 11 point 3 and 10 point 9 comma 17 point 5 Which equation could Darius use to determine the length, in centimeters, of a "typical” rectangle for a given width in centimeters?

Revolt · Accepted Answer

y is equal to 1 point 5 1 8 x plus 0 point 9 9 5

Question 6

Titus works at a hotel. Part of his job is to keep the complimentary pitcher of water at least half full and always with ice. When he starts his shift, the water level shows 8 gallons, or 128 cups of water. As the shift progresses, he records the level of the water every 10 minutes. After 2 hours, he uses a regression calculator to compute an equation for the decrease in water. His equation is W approximately equal to negative 0 point 4 1 4 t plus 129 point 5 4 9 , where t is the number of minutes and cap w is the level of water. According to the equation, after about how many minutes would the water level be less than or equal to 64 cups?

Revolt · Accepted Answer

160 minutes

Question 7

Matthew recorded the average speed of his baseball pitches, y , in miles per hour, after each pitching practice, x The equation of the line of best fit for the data set is y=0.64⁢x+66.24 Use the equation to estimate the average speed of Matthew’s pitches after 8 pitching practices. Enter your answer in the box. [Blank 1] miles per hour

Revolt · Accepted Answer

71.36

Question 8

Which table shows a negative correlation?

Revolt · Accepted Answer

Table with 2 columns and 7 rows.Row 1: Column 1, 'x'; Column 2, 'y' Row 2: Column 1, '2'; Column 2, '4' Row 3: Column 1, '5'; Column 2, '2' Row 4: Column 1, '6'; Column 2, 'negative 4' Row 5: Column 1, '7'; Column 2, 'negative 3' Row 6: Column 1, '10'; Column 2, 'negative 11' Row 7: Column 1, '12'; Column 2, 'negative 12'

Question 9

Raquel throws darts at a coordinate grid centered at the origin. Her goal is to create a line of darts. Her darts actually hit the coordinate grid at negative 5 comma 0 , 1 comma negative 3 , 4 comma 5 , negative 8 comma negative 6 , 0 comma 2 , and 9 comma 6 Which equation best approximates the line of best fit of the darts?

Revolt · Accepted Answer

y is equal to 0 point 6 x plus 0 point 6

Question 10

Which is the approximate slope of the line of best fit for the data?

Revolt · Accepted Answer

negative 4 point 5

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