Sparton 1
Oliver Sparton
Professor Patty Morrissey
MEDC 5000 Media Communications
3 February 2017
All in the Family Paper
The media plays a role in how society perceives individuals. In a time where
racism and prejudice are at an all time high, many peopl
Note: A more extensive table containing all values from 1 to 100 is in Table 2 of Appendix B
(Other values are on the back side of this sheet.)
Degrees
Of Freedom
Area in Upper Tail
.05
.025
.20
.10
.01
.005
31
32
33
34
.853
.853
.853
.852
1.309
1.309
1.3
Roulette examples
Use the figure to the right to help
with the following problems:
1.) A $1 bet is placed on a
single number (#13). What
is the expected value of
your winnings?
2.) A $2 bet is placed on even
numbers. What is the
expected value of your
win
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Confidence Intervals
1. Suppose that x 100 , 20 , n 400 . Find a 87% confidence interval for .
2. A utility company serves 50,000 households. As part of a survey of customer
attitudes, they take a simple random sample of 750 of these households. The
avera
Hypothesis Testing For a Proportion
4
of all UMSL students take a
5
statistics class. If a sample of 30 people has 20 who take a statistics class, and we
want to be 95% sure that we dont make a Type I error, determine if the math
departments claim was wro
Hypothesis Testing Known
1. Hurricane Andrew swept through southern Florida causing billions of dollars of
damage. Because of the severity of the storm and the type of residential
construction used in this area, there was some concern that the average cla
Hypothesis Testing Unknown
Find the p-value range for each of the following tests:
1. Right-tailed test with n 7 and with test statistic t 3.500
2. Left-tailed test with n 27 and with test statistic t 1.500
3. Two-tailed test with n 21 and with test stati
Confidence Intervals (Review)
1. A psychologist is studying learning in rats. The psychologist wants to determine
the average time required for rats to learn to traverse a maze. She randomly
selects 40 rats and records the time it takes for the rats to tr
Interval Estimation for a Proportion
1. Out of 50 students surveyed, 41 felt that parking was a serious problem on
campus. Find the following:
a. The point estimate for the proportion of all students who think parking is a
serious problem on campus.
b. Th
Hypothesis Testing Review
1. It has been reported that the average credit card debt for college seniors is $3262.
The student senate at a large university feels that their seniors have a debt much
less than this, so it conducts a study of 50 randomly sel
Section 8.4: Interval Estimation for a Proportion
Recall: The sampling distribution of p can be approximated by a normal distribution
whenever np 5 and n(1 p) 5 . The normal distribution was centered at p and had a
standard deviation of p
p (1 p )
.
n
Al
Section 9.3: Hypothesis Testing when is known
There are two types of hypothesis tests that we will learn about.
ONE TAILED TESTS
Use a one-tailed test when your hypotheses are inequalities:
Ho : #
Ho : #
or
Ha : #
Ha : #
Example: A soda manufacturer claim
Section 9.4: Hypothesis Testing when is unknown
The idea is very similar to a when was known:
1.) Form your null and alternative hypotheses
2.) Specify your significance level,
3.) Take a sample and compute n, x , and s .
x
4.) Compute the value of the t
Confidence Intervals
1. Suppose that x 100 , 20 , n 400 . Find a 87% confidence interval for .
z /2 1.51
100 1.51
20
100 1.51
98.49,101.51
400
2. A utility company serves 50,000 households. As part of a survey of customer
attitudes, they take a simpl
Section 8.2: Interval Estimation ( unknown)
Most of the time when you need to use a sample to estimate the population mean, you
wont know the population standard deviation. So you can use the point estimate, s, to
approximate . However, when you do this,
Confidence Intervals (Review)
1. A psychologist is studying learning in rats. The psychologist wants to determine
the average time required for rats to learn to traverse a maze. She randomly
selects 40 rats and records the time it takes for the rats to tr