Unit 9 Quiz Review

For 10 days, Ashley kept a record of the number of hours she spent practicing piano. The information is in the table.

Which scatter plot shows Ashley's data graphically?

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Tags

CCSS.8.SP.A.1

A line of best fit has been drawn on the scatter plot.

Which of the following describes the relationship between these variables?

• negative correlation

• no correlation

• zero correlation

• positive correlation

Tags

CCSS.HSS.ID.B.5

The scatter plot below shows the profit, by month, for Allen's new company during its first year of operation. A line of best fit has been drawn in the diagram.

Using this line, what is the best estimate for profit in the 19th month.

• $3,750

• $4,500

• $40,000

• $45,000

The table shows the % Attendance, x, and the Overall Grade, y, of 9 different students in Algebra 1.

Which equation best represents the line of best fit for this set of data?

• y = 0.92x + 33.31

• y = 0.66x + 33.31

• y= 0.66x + 0.92

• y = 33.31x + 0.66

This table shows the Amount of Time Practicing (in minutes) (x)

with the Score in the Game (y).

Which of the following describes the correlation coefficient of the data?

• The correlation coefficient is 0.941. There is a strong negative correlation between the number of classes missed and the final exam score.

• The correlation coefficient is 0.941. There is a weak negative correlation between the number of classes missed and the final exam score.

• The correlation coefficient is 0.941. There is a weak positive correlation between the number of classes missed and the final exam score.

• The correlation coefficient is 0.941. There is a strong positive correlation between the number of classes missed and the final exam score.

Tags

CCSS.HSS.ID.C.8

Suppose that the table shows the prices of a loaf of bread and a jar peanut butter for 8 supermarkets.

The equation for the least squares line for the data is y ≈ 0.99x + 1.20 and r ≈ 0.96

• There is a weak positive correlation between the price of bread and the price of peanut butter. There is a not a likely cause-and-effect relationship because shoppers often don't buy both at the same time.

• There is a strong positive correlation between the price of bread and the price of peanut butter. There is a not a likely cause-and-effect relationship because shoppers often don't buy both at the same time.

• There is a weak positive correlation between the price of bread and the price of peanut butter. There is a likely cause-and-effect relationship because shoppers often buy both at the same time.

• There is a strong positive correlation between the price of bread and the price of peanut butter. There is a likely cause-and-effect relationship because shoppers often buy both at the same time.

Tags

CCSS.HSS.ID.C.9

There is a known relationship between Temperature (x) and Number of Hot Cocoas sold (y). The table and accompanying scatter plot show the temperatures for each day and the number of hot cocoas sold at the football games.

Find an equation of the line of best fit. Then use your equation to predict the height of how many hot cocoas are sold when it is 35 degrees.

• y= -0.73x + 65.68; There should be 32 hot cocoas sold.

• y= -0.73x + 65.68; There should be 37 hot cocoas sold.

• y= 65.68x -0.73; There should be 37 hot cocoas sold.

• y= 65.68x -0.73; There should be 32 hot cocoas sold.

Which quantities are most likely to have a cause-and-effect relationship?

• The amount of ice cream sold and the number of people wearing hats.

  
  

• The temperature outside and the rate of mold growth.

• A student’s grade in math class and the student’s grade in art class.

• The average number of cell phones per household in a country and the country’s average height.

Carlos and Clarita researched the prices of several different Funko Pops and made a scatter plot of the data. The equation of the line of best fit for their data is y = 5.54x + 12,

where y is the price of the Funko Pop and x is the number of months that the Funko Pop has been available.

What is the real-world meaning of the slope of this line?

• A Funko Pop's price decreases by about $5.54 each month that it is available

• The original price of each pair of Funko Pop was $5.54.

• The original price of each pair of Funko Pop was $12

• A Funko Pop's price increases by about $5.54 each month that it is available

Tags

CCSS.HSF.LE.B.5

The equation y= −12.76x + 824.55 gives the price y of a particular model of cell phone x months after the cell phone first became available. What is the real-world meaning of the y-intercept?

• The original price of the cell phone was about $12.76.

• The price of the cell phone decreases by about $12.76 each month.

• The original price of the cell phone was about $824.55

• The price of the cell phone decreases by about $824.55 each month.

Tags

CCSS.HSF.LE.B.5