A brief quiz.

1. A little math quiz. You
have this many minutes.
Pop Quiz Math Clock by flickr user _ES

2. hello
1. Someone once said that a dog year is the same as seven
human years. Research has suggested that the comparison
between dog years and human years is actually the following:
(a) Enter the data into (b) What is the
your calculator and y-intercept?
find the line of best fit.
Write the equation.
(c) What is the meaning of the (d) Using this model, how many
y-intercept? What should it be? human years is 10 dog years?

3. 2. The following data compares the circumference of a person's
wrist compared to the neck size in cm.
(a)Enter the data into your
calculator and find the line of
best fit. Write the equation.
Sketch the graph at right.
(b) What is the y-intercept?
What is the meaning of the
y-intercept? Does it make
sense?
(c) Using your model (d)Using your model (equation)
(equation), what is the what is the wrist size of a person
neck size of a person with witih a neck size of 42 cm?
a wrist size of 13 cm?

4. The following data shows the age of certain cars and their
corresponding prices:
HOMEWORK
Graph age vs.price.
Construct a scatter plot of the data.
Determine the line of best fit.
1. What is the equation of the line?
2. What is the value of the y-intercept? What is its real-world
significance?
3. What is the real-world significance of the slope?
4. Is this a good model for car prices? Why or why not?

5. In an experiment, the following masses were attached to
a spring. As they were attached, the following elongations
were recorded:
HOMEWORK
1. What is the independent variable?
2. Use your graphing calculator to
plot the elongation against mass.
3. Use your calculator to find a regression line (line
of best fit) for the data. What is the y-intercept?
4. Select two points in the table and use
them to calculate the slope of the line.
5. Is it the same in the equation of the line?
6. Do you think that this model for the elongation of the
spring is always accurate? What do you think would
happen if the mass were increases to 15 kg?