Study Guide KEY
Mini 6 Unit Troup County Schools
Describe the associations (correlations) in the graphs below:
1.
strong negative
2. strong
positive
3.
no correlation
What kind of associations (correlations) would you expect to find in each situation?
( Strong positive, weak positive, positive, strong negative, negative, weak negative, or no association?)
4. The amount you eat and your weight.
CC.8.SP.3
positive association
5. The amount of items you purchase and the money left in your wallet.
6. The color of your hair and how fast you can run?
negative association
No association
7. Draw a line of best fit.
8. Write the equation of the line you drew.
y=
CC.8.SP.2
+ 1.38 (Answers will vary.)
TRUE OR FALSE?
CC.8.SP.2
False
9. The line of best fit must be altered, moved, or curved to fit through all the points in the scatter plot.
True 10. Points that are far away from the line of best fit are called outliers.
False 11. Points that are far away from the line of best fit are called wayouts.
False 12. If some points are not on the line of best fit, they have been graphed incorrectly and need to be plotted again.
True 13. The line of best fit is not meant to go through all points so long as goes through many of them.
True 14. If all points are on the line of best fit that is a linear function, not a scatter plot.
8th Math Unit Mini 6 Study Guide KEY Page 1
Use the table to answer questions 15-18.
15. Fill in the blanks in the table.
10th Graders
Has a Job
No Job
Total
Can Drive
46%
10%
56%
Can't Drive
11%
33%
44%
Total
57%
43%
100%
Some 10th graders can drive and some cannot. Some 10th graders have jobs and some do not.
Read the following statements and decide if they are TRUE or FALSE.
True
16. Most 10th graders have jobs.
False
17. Most 10th graders cannot drive.
True
18. Most of the 10th graders who have jobs also can drive.
CC.8.SP.4
19. If there are a total of 1050 tenth graders in the school, how many of them have jobs and can also drive?
483 of the 10th graders have a job AND can drive.
Use the table to answer questions 20 - 25.
( 1050 times .46 = 483)
Boys
Girls
Yes Pencil
33
27
No Pencil
11
25
20. How many students were included in the data?
CC.8.SP.4
96 total students (32+12+28+24=96)
CC.8.SP.4
TRUE or FALSE?
CC.8.SP.4
True
21. Most girls have pencils. (27 have pencils and 25 do not.)
True
22. Most boys have pencils. (33 have pencils and 11 do not.)
False
23. More girls than boys have pencils. (Only 27 girls have pencils, but 33 boys do.)
True
24. More girls than boys were surveyed. ( 52 girls were surveyed, but only 44 boys were.)
55%
25. What percent of students with pencils are boys? (
x = 55%
8th Math Unit Mini 6 Study Guide KEY Page 2