# Correlation coefficient & Margin of Error

Calculate the correlation of the data set (3,2), (3,3), (6,4).

A 95% confidence interval for the average miles per gallon for all cars of a ginven type is 32.1 plus/minus 1.8. The interval is based on a sample of 40 randomly selected cars.

What units represent the margin of error?

Suppose you want to decrease the margin of error, but want to keep the 95% confidence interval. What do you need to do?

https://brainmass.com/statistics/correlation/correlation-coefficient-margin-error-365294

#### Solution Preview

Please see the attachments.

Calculate the correlation of the data set (3, 2), (3, 3), (6, 4).

Answer

X Y X^2 Y^2 XY

3 2 9 4 6

3 3 9 9 9

6 4 36 16 24

12 9 54 29 39

The correlation between X, Y is ...

#### Solution Summary

The solution provides step by step method for the calculation of correlation coefficient and margin of error. Formula for the calculation is also included.