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The Student Recreation Center wanted to determine what sort of
physical activity was preferred by students. In a survey of 59
random students, 37 indicated that they preferred outdoor exercise
over exercising in a gym. The 90% confidence interval estimating
the proportion of all students at the university who prefer outdoor
exercise is given by which of the following?
Question 7 options:
1)
( 0.26933 , 0.47643 )
2)
( 0.56416 , 0.69007 )
3)
( 0.54644 , 0.7078 )...
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Part A:
Suppose you work for a pharmaceutical company that is testing a
new drug to treat ulcerative colitis. You conduct a random sample
of 34 patients on the new drug and 14 of them indicated a decrease
in symptoms since starting the drug regimen. You construct a 90%
confidence interval for this proportion to be ( 0.2733 , 0.5502 ).
What is the correct interpretation of this confidence interval?
1)
We are certain that 90% of patients will be...
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Question 5 (1 point)
In a sample of 40 Major League Baseball (MLB) players, 16 of
them are left handed hitters. For a 95% confidence interval for the
proportion of MLB players that bat left handed, what is the margin
of error?
Question 5 options:
1)
0.0775
2)
0.0240
3)
0.1270
4)
0.1518
5)
0.0118
Question 6 (1 point)
Not all Walmart stores carry the same merchandise. In fact, in
an audit of 1111 random stores, only 283 carried snowsuits...
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You are curious about the average number of yards Matthew
Stafford throws for each game for the Detroit Lions. You randomly
select 23 games and see that the average yards per game is 344.5
with a standard deviation of 27.8 yards. You want to create a 95%
confidence interval for the true average number of yards per game
he throws. What is the margin of error for this estimate?
Question 1 options:
1)
1.5833
2)
5.7967
3)
12.0216
4)
9.9538...
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Question 5 (1 point)
You are watching a nightly news broadcast on CNN and the
reporter says that a 95% confidence interval for the proportion of
Americans who supported going to war in Iraq was ( 0.2849 , 0.3511
). You also note that the footnote says this is based on a random
sample performed by Gallup with 761 respondents. What is the
correct interpretation of this confidence interval?
Question 5 options:
1)
We are 95% confident that the proportion...
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In a recent survey of 114 WMU graduates, 52 students said that
parking was too limited on campus. What is the estimate of the
population proportion? What is the standard error of this
estimate?
Question 1 options:
1)
Estimate of proportion: 0.456, Standard error: 0.0044.
2)
Estimate of proportion: 0.456, Standard error: 0.0466.
3)
Estimate of proportion: 0.544, Standard error: 0.0466.
4)
The true population proportion is needed to calculate
this.
5)
Estimate of proportion: 0.544, Standard error: 0.0044.
Question...
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According to a survey of 795 small business participants chosen
at random in the Constant Contact Small Biz Council in May of 2013,
480 of the respondents say it is harder to run a small business now
than it was 5 years ago. When estimating the population proportion,
what is the 95% confidence interval estimating the proportion of
businesses who believe it is harder to run a business now than 5
years ago?
Question 7 options:
1)
( 0.58643 ,...
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Question 2 (1 point)
You are tracking Chipotle Mexican Grill's stock price,
attempting to figure out a good price point for entry into the
market. You look at 50 random days over the course of a few months
and see that the closing price has an average of $261.23 with a
standard deviation of $19.35. You construct a 95% confidence
interval for the average stock price to be (255.73, 266.73). Of the
following choices, what is the appropriate interpretation of...
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A local pizza place claims that they average a delivery time of
10.14 minutes. To test this claim, you order 13 pizzas over the
next month at random times on random days of the week. You
calculate that the average delivery time is 8.59 minutes with a
standard deviation of 1.721 minutes. You create a 99% confidence
interval of (7.13, 10.05). Of those listed below, what is the best
conclusion you can make?
Question 7 options:
1)
The percentage of...
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Question 1 (1 point)
A customer wants to estimate the average delivery time of a
pizza from the local pizza parlor. Over the course of a few months,
the customer orders 29 pizzas and records the delivery times. The
average delivery time is 23.69 with a standard deviation of 7.212.
If the customer estimates the time using a 95% confidence interval,
what is the margin of error?
Question 1 options:
1)
0.7137
2)
2.2782
3)
2.7433
4)
1.3392
5)
2.739...