Math 8 - Statistics Quiz

The school store did a study comparing the cost of a sweatshirt with the number of sweatshirts sold. The price was changed several times and the numbers of sweatshirts sold were recorded. The data are shown in the table. Which scatter plot represents the data?

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Tags

CCSS.8.EE.B.5

Which scatter plot shows the relationship between x and y if x represents a student score on a test and y represents the number of incorrect answers a student received on the same test?

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CCSS.HSF-LE.A.1B

A line of best fit has been drawn on the scatter plot. The relationship between these variables can be described as having

• a negative correlation

• no correlation

• a positive correlation

• zero correlation

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CCSS.HSS.ID.B.5

The scatter plot below represents the relationship between the number of peanuts a student eats and the student's bowling score. Which conclusion about the scatter plot is valid?

• There is almost no relationship between eating peanuts and bowling score.

• Students who eat more peanuts have higher bowling scores.

• Students who eat more peanuts have lower bowling scores.

• No bowlers eat peanuts.

Tags

CCSS.8.SP.A.1

The scatter plot below shows the profit, by month, for a new company for the first year of operation. Kate drew a line of best fit, as shown in the diagram. Using the line, what is the best estimate for profit in the 18th month?

• $35,000

• $37,750

• $42,500

• $45,000

Tags

CCSS.8.SP.A.1

CCSS.8.SP.A.2

A scatter plot was constructed on the graph below and a line of best fit was drawn. What is the equation of this line of best fit?

• y = x + 5

• y = x + 25

• y = 5x + 5

• y = 5x + 25

Tags

CCSS.8.EE.B.5

The maximum height and speed of various roller coasters in North America are shown in the table. Which graph represents a correct scatter plot of the data?

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CCSS.8.SP.A.1

Which situation describes a negative correlation?

• the amount of gas left in a car's tank and the amount of gas used from it

• the number of gallons of gas purchased and the amount paid for the gas

• the size of a car's gas tank and the number of gallons it holds

• the number of miles driven and the amount of gas used

Tags

CCSS.HSS.ID.B.5

Megan and Bryce opened a new store called the Donut Pit. Their goal is to reach a profit of $20,000 in their 18th month of business. The table and scatter plot represent the profit, P, in thousands of dollars, that they made during the first 12 months.

a) Write an equation of a line of best fit that passes through the points (2, 2.5) and (6, 5.5).

b) Using your line of best fit equation, predict whether Megan and Bryce will reach their goal in the 18th month of their business.

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CCSS.6.EE.A.2

CCSS.6.EE.B.6

CCSS.6.EE.C.9

CCSS.6.SP.B.4

Emma recently purchased a new car. She decided to keep track of how many gallons of gas she used on five on her business trips. The results are shown in the table.

a) Write the equation of a line of best fit that passes through the points (150, 7) and (200, 10).

b) Using your line of best fit equation, predict how many gallons of gas would be used for an 800 mile business trip.

c) Using your line of best fit equation, predict how many miles were driven if 80 gallons of gas were used.

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CCSS.6.EE.B.6

CCSS.6.EE.B.7

CCSS.6.EE.C.9