1.Explain how to determine whether a scatter plot has a positive or negative correlation.
2. Draw sketches of scatter plots that have each type of correlation.
a. Very strong positive
b. Very strong negative
c. No correlation
3. Describe a situation that illustrates each type of plot in Question 2.
4. What does the r value on a graphing calculator tell you? Give examples.
5. What situations in your own life would present a negative correlation?
Explain whether a scatter plot for each pair of variables would show a positive, negative, or no correlation between variables.
6. Money earned by a restaurant worker and time spent on the job.
7. Heights of fathers and sons.
8.Grades in school and how many times you miss class.
9. Biology The table below shows the average boby temerature (in degrees Celsuis) of 14 insects at a given air temperature (in degrees Celsuis). Worth 2 points
| Air | Insect Body |
|
25.7 43.2 28.7 31.2 31.5 26.2 30.1 31.5 30.4 28.8 37.5 35.6 23.0 18.2 |
27.0 41.0 28.9 31.0 31.5 25.6 28.4 31.7 31.5 28.9 36.7 27.5 24.5 18.7 |
a. Draw a scatter plot and a best-fit line for this data.
b. Write an equation for the best-fit line
c. What conclusion might you draw form the data.