Problem 4E
In a study similar to the one in Exercise 3, the relative humidity and ozone levels were measured for 120 days in another city. The MINITAB output follows. Assume that assumptions 1 through 4 on page 540 hold.
The regression equation is Ozone = 29.7  0.135 Humidity 




Predictor 
Coef 
SE Coef 
T 
P 
Constant 
29.703 
2.066 
14.38 
0.000 
Humidity 
0.13468 
0.03798 
3.55 
0.001 
S = 6.26 
RSq = 9.6% 
RSq(adj) = 8.9% 
a. What is the slope of the leastsquares line?
b. Find a 95% confidence interval for the slope
c. Perform a test of the null hypothesis that the slope is greater than or equal to 0.1. What is the Pvalue?
Chapter 5 Bivariate Data two variables for on individual to find a relationship between one another When analyzing describe each variable and describe the relationship Explanatory variable X, used to predict, independent Response variable Y, dependent Scatterplot the variables measured by the same individual Linear relationship straight line Nonlinear relationship a relationship but not at all a straight line Positive Y increases as x increases Negative Y decreases as x increases Correlation Coefficient calculate r, measures the strength of the linear relationship, strength plus the direction the graph is going Cross Product Sxy the sum of the relationship, when the variables are not related, or when both have a positive or negative relationship How outlier