B 95 percent of the population has changed their hdl

b)
95% percent of the population has changed their HDL after eating raw garlic six days a week for six
months.
c)
The study used a method that gives a results within 6 mg/dl of the truth about the population in 95% of
all samples.
d) We could be certain that the study result is within 6 mg/dl of the truth about the population if the
conditions for inferences were satisfied.
e)
We can be certain that the study results is within 6 mg/dl of the truth about the population.
Question 6
Your answer is CORRECT.
Suppose you wish to perform a hypothesis test for a population mean. Suppose that the population standard
deviation is unknown, the population is skewed to the right, and the sample is large. Would you perform a z-
test or t-test?
a)
The t-test is appropriate.
b)
The z-test is appropriate.
c)
Either test is appropriate.
d)
Neither test is appropriate.
Question 7
Your answer is CORRECT.
In a random sample of 220 men (18 or older), 135 are married. Construct a 93% confidence interval to
estimate the true proportion of married men (18 or older).
a)
(0.554, 0.662)
b)
(0.581, 0.646)
c)
(0.554, 0.673)

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d)
(0.565, 0.662)
e)
None of the above.
Question 8
Your answer is INCORRECT.
A sample of 31 boxes of cereal has a sample standard deviation of 0.81 ounces. Construct a 93% confidence
interval to estimate the true standard deviation of the filling process for the boxes of cereal.
a) (0.433, 1.120)
b)
(0.658, 1.058)
c) (0.525, 1.095)
d)
(0.731, 0.731)
e)
None of the above.
Question 9
Your answer is INCORRECT.
A pizza delivery company claims that its average delivery time is less than 45 minutes. If any driver that has
a mean of less than 45 minutes gets a bonus in their paycheck. One driver did get that bonus but really his
mean delivery time was 55 minutes. This is an example of
a)
Type I error
b)
Type II error
c)
Type III error
d) Correct decision
e)
Free pizza
Question 10
Your answer is INCORRECT.