Exam (elaborations)
STA 2023 Elementary Statistics STA 2023 Final Review Exam 2 Questions with Verified Answers
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- Saint Petersburg College
STA 2023 Elementary Statistics
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Determine the Point Estimate for a Population ProportionQuestion 1 0..333333333 points
Determine the point estimate.
A survey of 500 likely voters showed that 385 felt that the economy was the most important national issue.
Find a point estimate (p-hat) for p, the population proportion of voters who feel the economy is the most
important national issue.
Question options:
385
1.30
0.77
0.08
Identify the Point Estimate from a Confidence Interval
Question 2 0..333333333 points
Determine the margin of error.
It has been determined with 95% confidence that the proportion of Americans who eat turkey on Thanksgiving
is between 0.78 and 0.82.
Determine the margin of error associated with this confidence interval.
Question options:
±0.95
±0.0
4
±0.1
, 0
±0.0
2
±0.0
5
Identify the Margin of Error from a Confidence Interval
Question 3 0..333333333 points
Determine the point estimate.
It has been determined with 95% confidence that the proportion of Americans who eat turkey on Thanksgiving
is between 0.78 and 0.82.
Determine the sample proportion that was used to build this confidence interval.
Question options:
0.95
0.80
0.05
0.82
0.78
Constructing a Confidence Interval given a Point Estimate and Margin of Error
Question 4 0..333333333 points
Determine the specified confidence interval.
An article estimates, with 90% confidence, that the proportion of elementary school teachers who are female is
82%. The article also specifies a margin of error equal to 0.03.
Determine the resulting 90% confidence interval for the proportion of elementary school teachers who are
female.
, Question options:
(0.82 , 0.85)
(0.79 , 0.85)
(0.805 , 0.835)
(0.79 , 0.82)
(0.87 , 0.93)
Constructing a Confidence Interval for a Mean given S
Question 5 0..333333333 points
Construct the requested confidence interval.
A meteorologist was interested in the average speed of a thunderstorm in his area. He sampled 13 thunderstorms
and found that the average speed at which they traveled across the area was 15 miles per hour with a sample
standard deviation of 1.7 miles per hour.
Assuming the speed of a thunderstorm is approximately normal, construct a 99% confidence interval for the
true average speed of a thunderstorm in his area.
Question options:
(10.6, 19.4)
(13.8, 16.2)
(13.6, 16.4)
(5.2, 24.8)
(14.2, 15.8)
Constructing a Confidence Interval for a Proportion
Question 6 0..333333333 points
Construct the requested confidence interval.
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