Algebra I –Quiz



Math 1 Name _______________________

Unit 2 - Review Date__________ Period_________

1. Determine whether a scatter plot of the data for the following might show a positive, a negative, or no association. If it has a correlations, is it also a causation?

a. weight vs. hours of exercise b. birth date vs. ring size

c. temperature vs. ice cream sales d. age of a tree vs. number of rings

e. height vs. intelligence f. water level of a water bottle vs.

number of sips taken

2. The table below shows the ideal weight for a man of the given height.

|Height (inches) |66 |68 |70 |72 |74 |76 |78 |

|Weight (lbs) |143 |153 |164 |171 |183 |198 |206 |

a. Use the calculator to find the line of best fit.

b. Find r and interpret its meaning.

c. Predict the ideal weight of a man who is 71 inches tall.

d. Predict the height of a man whose ideal weight is 215 pounds.

e. What is the residual for a man who is 74 inches tall?

f. Explain the meaning of the slope.

3. The table below shows the years of experience for 8 encyclopedia sales people and the amount of sales/month.

|Years of |6 |

|Experienc| |

|e | |

|-1 |2.5 |

|0 |5 |

|1 |10 |

|2 |20 |

|3 |40 |

|X |Y |

|-1 |-5 |

|0 |-2 |

|1 |1 |

|2 |4 |

|3 |7 |

|X |Y |

|-3 |4 |

|-2 |1 |

|-1 |0 |

|0 |1 |

|1 |4 |

|X |Y |

|0 |0.5 |

|1 |5 |

|2 |50 |

|3 |500 |

|4 |5000 |

6. 7. 8. 9.

Find the slope of the line that passes through each pair of points.

1. (3, 2), (5, 6) 2. (-4, 4), (2, -5) 3. (-5, 0.5), (-5, 3) 4. (3, 4), (-3, 4)

Graph each line using y = mx + b. State the slope and y-intercept for each equation.

10. 2x + y = -2 11. 5x + 3y = 15 12. -3x ( 4y = 16

m= m= m=

b= b= b=

13. 4y = 2x 14. y = 4 15. 2y ( 6 = 3x

m= m= m=

b= b= b=

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