Homework 1.

As researchers for the EPA we are testing whether the concentration of E Coli bacteria in the Charles river is a function of rainfall.

Below is a summary output of a regression analysis you performed on the data you collected.

SUMMARY OUTPUT
Regression Statistics
R Square	0.689
Observations	365
	Coefficients	t Stat
Intercept	203	1.5
Volume of rain	23	11.2

Please answer the following questions:

1. What does the R squared mean for the impact of rainfall on E Coli bacteria levels in the river?

2. Is the intercept significant – what does it mean?

3. Is the coefficient called “volume of rain” significant? What does this mean?

4. Please write the regression equation, only including significant coefficients.