In an study similar to the one in Exercise 3, the relative humidity and ozone levels

Chapter 7, Problem 4

(choose chapter or problem)

In an 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 544 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

R−Sq

= 9.6%

R−Sq(adj)

= 8.9%

What is the slope of the least-squares line?Find a 95% confidence interval for the slope.Perform a test of the null hypothesis that the slope is greater than or equal to −0.1. What is the P-value?

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