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Page 1
Question 1
2 out of 2 points
Which of the following is correct?
Selected
Answer:
As the standard deviation increases, the width of the confidence interval
increases.
Correct
Answer:
As the standard deviation increases, the width of the confidence interval
increases.
Response
Feedback:
This is correct. Text reference: Section 15.2 How Confidence Intervals
Behave
Question 2
2 out of 2 points
A November 2008 Gallup Poll asked a sample of Americans 18 years old or older whether
they would like to "lose weight, stay the same, or gain weight." In all, 59% of the sample said
that they would like to lose weight. Gallup announced the poll's margin of error for 95%
confidence as ±3 percentage points. Which of the following sources of error are included in
the margin of error?
Selected Answer:
If the survey were to be repeated, different numbers would be dialed.
Correct Answer:
If the survey were to be repeated, different numbers would be dialed.
Response
Feedback:
This is correct. Text reference: Section 15.2 How Confidence Intervals
Behave
Question 3
2 out of 2 points
A shipment of 1000 small lab mice arrives at the animal care facility with a nominal weight
of 10 g per mouse. A sample of 20 mice is selected and weighed. The average weight of the
sample is 10.2 g. From past shipments, it is known that the standard deviation of weight
among mice is 2 g. How many mice need to be sampled to ensure that the 95% confidence
interval has a margin of error of 0.5 g?
Selected Answer:
62
Page 2
Correct Answer:
62
Response
Feedback:
This is correct. Text reference: Section 15.4 Planning Studies: Sample
Size for Confidence Intervals
Question 4
2 out of 2 points
We perform a statistical test to examine if the mean lifetime of lab mice increases when given
Vitamin C compared to a placebo. Which of the following is a Type I error?
Selected
Answer:
Conclude that Vitamin C increases the mean lifetime when in fact it does
not.
Correct Answer:
Conclude that Vitamin C increases the mean lifetime when in fact it does
not.
Response
Feedback:
This is correct. Text reference: Section 15.5 Planning Studies: The
Power of a Statistical Test
Question 5
1 out of 1 points
We perform a statistical test to examine if the mean lifetime of lab mice increases when given
Vitamin C compared to a placebo. Which of the following is a Type II error?
Selected
Answer:
Conclude that Vitamin C does not increase the mean lifetime when in fact
it does.
Correct Answer:
Conclude that Vitamin C does not increase the mean lifetime when in fact
it does.
Response
Feedback:
This is correct. Text reference: Section 15.5 Planning Studies: The
Power of a Statistical Test
Question 6
1 out of 1 points
We perform a statistical test to examine if the mean lifetime of lab mice increases when given
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