Statistical Analysis Lesson 7
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Online Exam 8_07
Question 1 of 40
2.5 Points
A consumer group claims that the mean running time for a certain type of
flashlight battery is not the same as the manufacturer’s claims. Determine the
null and alternative hypotheses for the test described.
A.
H0: µ = Manufacturer’s claims Ha:
µ < Manufacturer’s claims
B.
H0: µ = Manufacturer’s claims Ha:
µ ¹ Manufacturer’s claims
C.
H0: µ = Manufacturer’s claims Ha:
µ > Manufacturer’s claims
D.
H0: µ ¹ Manufacturer’s claims Ha:
µ = Manufacturer’s claims
Question 2 of 40
If a fan purchased a bag with 30 peanuts, what is the lowest level at which
this would be a significant event?
A. 0.05
B. 0.025
C. 0.01
D. It is not significant at any of
the levels given
Question 3 of 40
2.5 Points
A researcher wants to check the
claim that convicted burglars spend an average of 18.7 months in jail. She
takes a random sample of 35 such cases from court files and finds that months. Assume that the population standard
deviation is 7 months. Test the null hypothesis that µ = 18.7 at the 0.05
significance level.
A.
Do not reject the null hypothesis and conclude that the claim that the mean
is different from 18.7 months is supported.
B.
Do not reject the null hypothesis and conclude that the claim that the mean
is different from 18.7 months cannot be supported.
C.
Reject the null hypothesis and conclude that the claim that the mean is
different from 18.7 months is supported.
D.
Reject the null hypothesis and conclude that the claim that the mean is
different from 18.7 months cannot be supported.
Question 4 of 40
2.5 Points
A two-tailed test is conducted at the 5% significance level. What is the
left tail percentile required to reject the null hypothesis?
A. 97.5%
B. 5%
C. 2.5%
D. 95%
Question 5 of 40
2.5 Points
A manufacturer claims that the mean amount of juice in its 16 ounce bottles
is 16.1 ounces. A consumer advocacy group wants to perform a hypothesis test to
determine whether the mean amount is actually less than this. The mean volume
of juice for a random sample of 70 bottles was 15.94 ounces. Do the data
provide sufficient evidence to conclude that the mean amount of juice for all
16-ounce bottles, µ, is less than 16.1 ounces? Perform the appropriate
hypothesis test using a significance level of 0.10. Assume that s = 0.9 ounces.
A.
The z of - 1.49 provides sufficient evidence to conclude that the mean
amount of juice is less than 16.1 oz.
B.
The z of - 1.49 does not provide sufficient evidence to conclude that the
mean amount of juice is less than 16.1 oz.
C.
The z of - 0.1778 does not provide sufficient evidence to conclude that the
mean amount of juice is less than 16.1 oz.
D.
The z of - 0.1778 provides sufficient evidence to conclude that the mean
amount of juice is less than 16.1 oz.
Question 6 of 40
2.5 Points
A poll of 1,068 adult Americans reveals that 52% of the voters surveyed
prefer the Democratic candidate for the presidency. At the 0.05 significance
level, test the claim that more than half of all voters prefer the Democrat.
A. Reject the null hypothesis.
Conclude that there is insufficient evidence that more than half of all voters
prefer Democrats.
B. Do not reject the null
hypothesis. Conclude that there is sufficient evidence that more than half of
all voters prefer Democrats.
C. Reject the null hypothesis.
Conclude that there is sufficient evidence that more than half of all voters
prefer Democrats.
D. Do not reject the null
hypothesis. Conclude that there is insufficient evidence that more than half of
all voters prefer Democrats.
Question 7 of 40
2.5 Points
A nationwide study of American homeowners revealed that 65% have one or
more lawn mowers. A lawn equipment manufacturer, located in Omaha, feels the
estimate is too low for households in Omaha. Find the P-value for a test of the
claim that the proportion with lawn mowers in Omaha is higher than 65%. Among
497 randomly selected homes in Omaha, 340 had one or more lawn mowers. Use
Table 5.1 to find the best answer.
A. 0.0559
B. 0.1118
C. 0.0252
D. 0.0505
Question 8 of 40
2.5 Points
A consumer advocacy group claims that the mean amount of juice in a 16
ounce bottled drink is not 16 ounces, as stated by the bottler. Determine the
conclusion of the hypothesis test assuming that the results of the sampling
lead to rejection of the null hypothesis.
A. Conclusion: Support the claim
that the mean is equal to 16 ounces.
B. Conclusion: Support the claim
that the mean is greater than 16 ounces.
C. Conclusion: Support the claim
that the mean is not equal to 16 ounces.
D. Conclusion: Support the claim
that the mean is less than 16 ounces.
Question 9 of 40
2.5 Points
A right-tailed test is conducted at the 5% significance level. Which of the
following z-scores is the smallest one in absolute value that leads to
rejection of the null hypothesis?
A. 1.61
B. 1.85
C. -1.98
D. -2.06
Question 10 of 40
2.5 Points
z = 1.8 for Ha: µ > claimed value. What is the P-value for the
test?
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