Algebra MP3 Quarterly Exam Part A

Which statement describes the sequence −9, −3, 3, 9, 15, …?

• an arithmetic sequence with common difference −9

• an arithmetic sequence with common difference 3

• an arithmetic sequence with common difference 6

• not an arithmetic sequence

Tags

CCSS.HSF.BF.A.2

Buying one movie ticket online costs $16.50. Two tickets cost $30.50. Assuming that the relationship is linear, what is the recursive formula?

• $A\left(n\right)=A\left(n-1\right)+14;\ A\left(1\right)=16.50$

• $A\left(n\right)=A\left(n-1\right)+16.50;\ A\left(1\right)=14$

• $A\left(n\right)=A\left(n-1\right)+30.50;\ A\left(1\right)=16.50$

Tags

CCSS.HSF.IF.A.3

Buying one movie ticket online costs $16.50. Two tickets cost $30.50. Assuming that the relationship is linear, what is the explicit formula?

•  $A\left(n\right)=16.50+14n$ 

•  $A\left(n\right)=2.50+14n$ 

•  $A\left(n\right)=30.50+\left(n-1\right)14$ 

•  $A\left(n\right)=14+\left(n-1\right)16.50$  

What type of association is shown by the data in the scatter plot?

• positive association

• negative association

• no association

• trend association

Tags

CCSS.HSF-LE.A.1B

When Hana goes to the mall, she always buys the same lunch and also buys some books. The table shows the number of books she buys x and the total amount of money she spends y. Given the data from the table, choose the best trend line.

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• 
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Tags

CCSS.8.EE.B.5

Hana writes the equation y = 5.5x + 11 to represent the trend line shown below. Use her equation to predict how much she will spend if she buys 8 books.

Tags

CCSS.HSF.LE.B.5

The calculator screen shows the linear regression for the data in the table.

What type of correlation does the correlation coefficient indicate?

• a strong positive correlation

• a weak positive correlation

• a strong negative correlation

• a weak negative correlation

The calculator screen shows a linear regression. Write the equation for the line of best fit for the data. Round values to the nearest integer.

• $y=19x-2$

• $y=x+19$

• $y=-2x+19$

• $y=19x-1$

Tags

CCSS.8.EE.C.8C

Choose the best explanation for the model described by the residual plot.

• The model is a good fit because the data are clustered at 1.

• The model is a good fit because the data are randomly distributed above and below the x-axis.

• The model is a bad fit because the data are not linear.

• The model is a bad fit because the data are too far from the x-axis.

Ricardo calculates a line of best fit for a data set with integer x-values 1 through 6.

Using a line of best fit with the equation y = –3x + 21 to predict the value of y when x = 10 is an example of...

• correlation

• extrapolation

• causation

• interpolation