# STATISTICS Chapter 4

Sec4.1

- Given below is a linear equation.

Y=5+2x

- Find the y-intercept and slope.

- Determine whether the line slopes upward, slopes downward, or is horizontal, without graphing the equation.

- Use two points to graph the equation.

- Given below is the y-intercept and slope, respectively, of a line.

-2 and 5

- Determine whether the line slopes upward, slopes downward, or is horizontal, without graphing the equation.

- Find its equation.

- Use tow points to graph the equation.

- A cellular phone company charges $20 for a phone and $30 per month for its economy plan. Let y denote the total cost in dollars and x denote the number of months.

- Find the equation that expresses y in terms of x.

- Determine and

- Construct a table for the x-values 9, 15, and 21.

Time(months) X | Cost ($) y |

9 | |

15 | |

21 |

- Graph the equation.

Sec4.2

- Given to the right are two linear equations and a set of data points.

X | 1 | 2 | 3 |

Y | 2 | 5 | 9 |

Line A: y=1+3x, Line B: y=-3+4x

- Graph the linear equation and data points in one plane.

- Complete tables for , for Line A and Line B.

Line A: y=1+3x

x | y | e | ||

1 | 2 | |||

2 | 5 | |||

3 | 9 |

Line B: y=-3+4x

x | y | e | ||

1 | 2 | |||

2 | 5 | |||

3 | 9 |

- Determine which line fits the set of data points better, according to the least-squares criterion.

- Find the regression equation for the data points. And Graph the regression equation and the data points.

X | 2 | 3 | 4 |

Y | 5 | 0 | 1 |

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