Section Problems #10
from book:
6.22 (page 358)
To clarify the question, the population standard deviation σ = $290.
Round your answers to four decimal
places
.
Also answer this question:
In Exercise 6.22, what is the smallest sample size that would achieve a margin of error
≤
$50 with 99%
confidence?
Remember to express your answer as a whole number.
6.34 (page 360)
a) Round your answers to four decimal places
.
b) Remember to express your answer as a whole number.
6.35 (page 360)
#1) The mean yield of corn in the US is about 120 bushels per acre.
A survey of 40 farmers this year
gives a sample mean yield of
x
= 123.8 bushels per acre.
We want to know whether this is good
evidence that the national mean this year is not 120 bushels per acre.
Assume that the farmers surveyed
are an SRS from the population of all commercial corn growers and that the standard deviation of the
yield in this population is σ = 10 bushels per acre.
We want to test:
H
0
:
μ = 120
H
a
:
μ
≠
120
Give the
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This note was uploaded on 02/22/2012 for the course PAM 2100 taught by Professor Abdus,s. during the Fall '08 term at Cornell.
 Fall '08
 ABDUS,S.

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