You may use a calculator on this quiz. You may not use a cell phone or computer. To receive full credit please show your work carefully and give justifications for your answers. If you find that you are spending a lot of time on one problem, leave it blank and move on to the next. There are questions on both sides of this page.

- (20 points) Find the slope of a line passing through points (1,2)
and (4, 23).
- (20 points) Find the equation of the line that contains the points
in the table:
**x**1 2 3 4 5 **y**3 10 17 24 31 - (20 points) A scatter plot is shown below. If the data appears
linear, draw a line that fits the data. If you think a linear model
would not represent the data well, explain why not.
- The table below shows the average ocean wave heights for different years over three decades.

Year | 1962 | 1968 | 1974 | 1979 | 1984 |

Wave Height (ft) | 6.9 | 7.6 | 7.7 | 9.3 | 8.9 |

a) (20 points) Which variable is the independent variable and which is the dependent variable? Why?

b) (20 points) Use the grid below to draw a scatter plot of the data with the independent variable along the horizontal axis and the dependent variable along the vertical axis.