Math 8 Data and Statistics

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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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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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

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.

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

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

There is a negative correlation between the number of hours a student watches television and his or her social studies test score. Which scatter plot displays this correlation?

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Which statement is true about the data shown in the scatter plot?

• There is no correlation between the two sets of data.

• There is a positive correlation between the two sets of data.

• There is a negative correlation between the two sets of data.

• The correlation between the data is both positive and negative.

The number of hours spent on math homework each week and the final exam grades for twelve students in Mr. Dylan's algebra class are plotted. Based on a line of best fit, which exam grade is the best prediction for a student who spends about 4 hours on math homework each week?

• 62

• 72

• 82

• 92

Based on the line of best fit drawn, which value could be expected for the data in June 2015?

• 230

• 310

• 480

• 540