Answered: An ecologist who analyzes water samples…

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

An ecologist who analyzes water samples tests the null
hypothesis that any contaminants in the water are below
dangerous concentrations. Because he uses a = 0.05, a
set of samples from a small lake that produced a P-value
of 0.07 led him to conclude that the evidence did not
point to unsafe water conditions. Which is true?
A) There’s a 7% chance the lake’s water really is safe.
B) There’s a 93% chance the lake’s water really is safe.
C) There’s a 7% chance his sampling would have shown
as much contamination as it did even if the lake’s
water really is safe.
D) If the lake’s water really is unsafe, there’s a 5%
chance he wouldn’t notice.
E) If he had taken more samples, he probably would
have rejected the null and concluded that the water
was unsafe.

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