Question

Alex puts his spare change in a jar every night. If he has $11.09 at the end of January, $22.27 at the end of February, $44.35 in April, $75.82 in July, $89 in August, and $114.76 at the end of October, perform a linear regression on this data to complete the following items.

Note: I can't seem to perform a linear regression on my calculator correctly.

1. What does the value of the correlation coefficient tell you about the correlation of the data?

2. Write the equation of the best-fitting line. (Round to the nearest thousandths)

3. On average, how much money does Alex add to the jar each month?

4. Alex wants to buy a video game console at the end of December for $140. Will he have enough for this purchase? (Show work)

Answer 1

dunno about your calculator, but at

http://www.alcula.com/calculators/statistics/linear-regression/

we get

y = 11.33x - 0.90

Answer 2

what does the value of the correlation coefficient tell you about the correlation of the data ?