



Class Time:
Names:
Student learning outcomes:
 The student will calculate a 90% confidence interval using the given data.
 The student will determine the relationship between the confidence level and the percent of constructed intervals that contain the population mean.
Given:

Heights of 100 women (in inches)
59.4 
71.6 
69.3 
65.0 
62.9 
66.5 
61.7 
55.2 
67.5 
67.2 
63.8 
62.9 
63.0 
63.9 
68.7 
65.5 
61.9 
69.6 
58.7 
63.4 
61.8 
60.6 
69.8 
60.0 
64.9 
66.1 
66.8 
60.6 
65.6 
63.8 
61.3 
59.2 
64.1 
59.3 
64.9 
62.4 
63.5 
60.9 
63.3 
66.3 
61.5 
64.3 
62.9 
60.6 
63.8 
58.8 
64.9 
65.7 
62.5 
70.9 
62.9 
63.1 
62.2 
58.7 
64.7 
66.0 
60.5 
64.7 
65.4 
60.2 
65.0 
64.1 
61.1 
65.3 
64.6 
59.2 
61.4 
62.0 
63.5 
61.4 
65.5 
62.3 
65.5 
64.7 
58.8 
66.1 
64.9 
66.9 
57.9 
69.8 
58.5 
63.4 
69.2 
65.9 
62.2 
60.0 
58.1 
62.5 
62.4 
59.1 
66.4 
61.2 
60.4 
58.7 
66.7 
67.5 
63.2 
56.6 
67.7 
62.5 
Listed above are the heights of 100 women. Use a random number generator to randomly select 10
data values.
 Calculate the sample mean and sample standard deviation. Assume that the population standard
deviation is known to be 3.3 inches. With these values, construct a 90% confidence interval for your sample of10 values. Write the confidence interval you obtained in the first space of the table below.
 Now write your confidence interval on the board. As others in the class write their confidence intervals
on the board, copy them into the table below:
90% confidence intervals
__________ 
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__________ 
__________ 
__________ 
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__________ 
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__________ 
__________ 
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Discussion questions
 The actual population mean for the 100 heights given above is
$\mu =\text{63}\text{.}4$ . Using the class listing of confidence intervals, count how many of them contain the population mean
$\mu $ ; i.e., for how many intervals does the value of
$\mu $ lie between the endpoints of the confidence interval?
 Divide this number by the total number of confidence intervals generated by the class to determine the percent of confidence intervals that contains the mean
$\mu $ . Write this percent below.
 Is the percent of confidence intervals that contain the population mean
$\mu $ close to 90%?
 Suppose we had generated 100 confidence intervals. What do you think would happen to the percent of confidence intervals that contained the population mean?
 When we construct a 90% confidence interval, we say that we are
90% confident that the true population mean lies within the confidence interval. Using complete sentences, explain what we mean by this phrase.
 Some students think that a 90% confidence interval contains 90% of the data. Use the list of data given (the heights of women) and count how many of the data values lie within the confidence interval that you generated on that page. How many of the 100 data values lie within your confidence interval? What percent is this? Is this percent close to 90%?
 Explain why it does not make sense to count data values that lie in a confidence interval. Think about the random variable that is being used in the problem.
 Suppose you obtained the heights of 10 women and calculated a confidence interval from this information. Without knowing the population mean
$\mu $ , would you have any way of knowing
for certain if your interval actually contained the value of
$\mu $ ? Explain.
This lab was designed and contributed by Diane Mathios.
Questions & Answers
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biomolecules are e building blocks of every organics and inorganic materials.
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sciencedirect big data base
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NANO
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are you nano engineer ?
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fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
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CYNTHIA
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NANO
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Harper
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s.
how to fabricate graphene ink ?
for screen printed electrodes ?
SUYASH
What is lattice structure?
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Ebrahim
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tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
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1 It is estimated that 30% of all drivers have some kind of medical aid in South Africa. What is the probability that in a sample of 10 drivers: 3.1.1 Exactly 4 will have a medical aid. (8) 3.1.2 At least 2 will have a medical aid. (8) 3.1.3 More than 9 will have a medical aid.
Source:
OpenStax, Collaborative statistics. OpenStax CNX. Jul 03, 2012 Download for free at http://cnx.org/content/col10522/1.40
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