Line of Best Fit — Quiz

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

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 3

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.

Revolt · Accepted Answer

71.36

Question 4

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 5

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; 170 minutes

Question 6

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

Revolt · Accepted Answer

none

Question 7

According to the line of best fit, what is the minimum amount, to the nearest dollar, Melinda will earn for each day of work, even if she serves no customers?

Revolt · Accepted Answer

26 dollars

Question 8

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

Revolt · Accepted Answer

positive

Question 9

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

Revolt · Accepted Answer

20

Question 10

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

Revolt · Accepted Answer

negative 4 point 5

Line of Best Fit — Quiz Answers

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