Answered: 1| 2 | 3 8.7 7.9 | 8.3 9.4 9.8 9.9 |…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Question

Long-distance runners have contended that moderate exposure to ozone increases lung
capacity. To investigate this possibility, a researcher exposed 12 rats to ozone at the rate
of 2 parts per million for a period of 30 days. The lung capacity of rats was determined at
the beginning of the study and again after the 30 days of ozone exposure. The lung
capacities (in mL) are given here:

(a) If we can assume normality, is there sufficient evidence to support the conjecture that
ozone exposure increases lung capacity? Use α = 0.01?

b) Estimate the size of the increase in lung capacity after exposure to ozone. Use a 99%
confidence interval.

1| 2 | 3
8.7 7.9 | 8.3
9.4 9.8 9.9 | 10.3
4
6 7
8 9 10 11
12
y-bar
Rat #
Before
After
9.2
8.2 8.1 8.9 | 8.2
8.9
8.45
8.4
9.1
7.5
0.52
8.9
8.8
9.8 8.2 9.4 9.9 | 12.2 | 9.3
9.66
0.99

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