MYLAB STATISTICS: ELEMENTARY STATISTICS
7th Edition
ISBN: 9780135901021
Author: Larson
Publisher: PEARSON EDUCATION (COLLEGE)
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Chapter 8, Problem 8.2.13RE
To determine
To test: Whether the mean of population 1 is less than or equal to the mean of population 2 or not.
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3. Let x be a random variable representing the concentration of chemical Z in human blood. Over a
long time frame a population mean u = 12% or above is considered unhealthy. A patient has taken
%3D
12 blood samples over the last two weeks. The average concentration from these 12 samples is X =
13% and s =
1.32%.
a.
Do these data suggest a population mean u higher than 12% for this patient? (Use a = 5%)
b. Using the sample data, generate a 99% confidence interval for u.
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
MYLAB STATISTICS: ELEMENTARY STATISTICS
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