Solution Data Analysis Assignment Make sure you do the following Points will be taken off if you do not For an

Solution Data Analysis Assignment Make sure you do the following Points will be taken off if

sure you do the following Points will be taken off if you do not For an example of formatting see the sample

Solution Data Analysis Assignment Make sure you do the following Points will be

taken off if you do not For an example of formatting see the sample

Solution Data Analysis Assignment Make sure you do the following

Solution Data Analysis Assignment Make

Category: | General |

Words: | 1050 |

Amount: | $12 |

Writer: |

Paper instructions

Problem 1: g) When n = 200, what is the approximate probability that the sample proportion will fall within 1.5 standard errors of the population proportion. Show your work (i.e., z-scores and values obtained from table).1
Data Analysis Assignment 4
Make sure you do the following.
Points will be taken off if you do not.
(For an example of
formatting, see the sample solutions document posted in Blackboard.)
1.Type your name on your paper.
2.Under your name, put STAT 250 with your correct section number (e.g. STAT 250-xxx).
3.Type Data Analysis Assignment 4
centered on Page 1.
4.Number your pages across your entire solutions document.
5.Number and letter the answers to each problem and each part of each problem accordingly. Keep
the problems (and parts of each problem) in order.
6.Use complete and coherent sentences to answer the explanation questions.
Generate all requested graphs using StatCrunch.
Place a copy of any requested graph in your
solutions document.
7.Title and label all of your graphs “correctly” (as demonstrated in lecture notes).
8.Unless explicitly stated in the problem, you DO NOT need to include ALL StatCrunch
output.
You just need to include the part of the output that answers the question (i.e., the
specifically requested statistics and/or graphs).
9.
Upload your solutions document onto Blackboard as a Word document.
10. Please note that there is no specific data files posted on our group in StatCrunch to use to
answer the following problems.
However, StatCrunch will be used to answer these
problems.
Problem 1:
Is Starbucks coffee overpriced? (25 Points)
A 2010 article reported that 93% of Americans feel Starbucks coffee is overpriced.
Consider
the population of all Americans.
a)
A random sample of
n
= 100 couples will be selected from this population and
ˆ
p
, the
proportion of Americans who believe Starbucks is overpriced will be computed.
What
are the mean and standard error of the sampling distribution of the sample proportion
ˆ
p
?
b) Is it reasonable to assume that the sampling distribution of the sample proportion
ˆ
p
is
approximately Normal for random samples of size
n
= 100?
Explain.
c)
Suppose that the sample size is
n
= 200 rather than
n
= 100 as in Part b.
Does the change
in sample size change the mean and standard error of the sampling distribution of the
sample proportion
ˆ
p
?
If so, what are the new values for the mean and standard error?
If
not, explain why not.
d) Is it reasonable to assume that the sampling distribution of the sample proportion
ˆ
p
is
approximately Normal for random samples of size
n
= 200?
Explain.

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