Elementary Statistics: Picturing the World (7th Edition)
7th Edition
ISBN: 9780134683416
Author: Ron Larson, Betsy Farber
Publisher: PEARSON
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Chapter 8.2, Problem 11E
To determine
To test: Whether the
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In Exercises 11 –14, test the claim about the difference between two population means u1 and u2 at the level of significance a. Assume the samples are random and independent, and the populations are normally distributed.
10.
Test the claim about the population mean
μ
at the level of significance
α.
Assume the population is normally distributed.
Claim:
μ<4915;
α=0.05
Sample statistics:
x=5017,
s=5613,
n=55
Question content area bottom
Part 1
What are the null and alternative hypotheses?
H0:
muμ
greater than or equals≥
4915
4915
Ha:
muμ
less than<
4915
4915
(Type integers or decimals. Do not round.)
Part 2
Find the standardized test statistic t.
t=enter your response here
(Round to two decimal places as needed.)
2. Let x be a random variable that represents the concentration of iron in water. The EPA specifies that
x has a normal distribution with o = 0.7. The company claims that the iron concentration population
mean is u = 2.0 downstream from the plant. But 10 samples taken downstream from an industrial
plant show an X = 2.48.
Chapter 8 Solutions
Elementary Statistics: Picturing the World (7th Edition)
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