## SmartOwl94 3 years ago Use a graphing calculator to determine which equation for the line of regression, Pearson product-moment correlation value (r), and predicted value match the data in the chart. The chart below shows the number of hours a student spent studying for a math test and the score the student earned on the test.

1. SmartOwl94

I'm posting the work

2. SmartOwl94

Hours Spent Studying | 0.5|1.25| 1.5 |1.75 |2 | 2.5 |3 |3.5 |4 | Test Score,,,................ | 90 | 75| 60 | 83 |75| 80| 99| 97| ? | A) y = 6.4x + 69.5, r = 0.48 Predicted test score for 4 hours of study equals 95. B) y = 6.1x + 74.5, r = 0.48 Predicted test score for 4 hours of study equals 99. C) y = 5.1x + 74.5, r = 0.88 Predicted test score for 4 hours of study equals 95. D) y = 7.4x + 69.5, r = 0.88 Predicted test score for 4 hours of study equals 99.

3. lisapeajac

Do you know how to turn the (r) on on your calculator?

4. SmartOwl94

I don't have a calculator yet.... I need a ti-83 or 84 and my mom hasn't bought one yet :(

5. SmartOwl94

The online graphing calculators are hard to use too...

6. lisapeajac

Then you can't do the problem. Google "virtual TI 84" and you should be able to download one

7. SmartOwl94

8. helder_edwin

u can use excel or any ohter spreadsheet program.

9. SmartOwl94

but how do I plot it in excel?

10. SmartOwl94

And thanks so much btw

11. helder_edwin

give me a couple of min.

12. SmartOwl94

okay thanks so much you are the best!

13. helder_edwin

here is the excel file

14. SmartOwl94

Thanks! SOOO Much!

15. helder_edwin

u r welcome