Question

Homework 2

Show Your Work!

1. The following 10 numbers were drawn from a population. Is it
likely that these numbers came from a population with a mean of 13?
Evaluate with a two-tailed test at alpha of .05.

5, 7, 7, 10, 10, 10, 11, 12, 12, 13

a. State in words what your H1 and H0 would be.

b. What kind of test would you use (i.e. Related-Samples t-test,
z-test, etc.)?

c. What is your df? What is your critical t?

d. Calculate t.

e. Based on the above information, would you reject H0, or fail to
reject it? Why? How would you state your conclusion in words?

f. Compute the 95% confidence limits on μ.

2. People with agoraphobia are so filled with anxiety about being
in public places that they seldom leave their homes. Knowing this
is a difficult disorder to treat, a researcher tries a long-term
treatment. A sample of individuals report how often they have
ventured out of the house in the past month. Then they receive
relaxation training and are introduced to trips away from the house
at gradually increasing durations. After 2 months of treatment,
participants report the number of trips out of the house they made
in the last 30 days. The data are as follows:

_______________________________________

Participant
Before
After

_______________________________________

A 0 4

B 0 0

C 3 14

D 3 23

E 2 9

F 0 8

G 0 6

_______________________________________

a) What type of t-test should we use?

b) Is a one-tailed or two-tailed test more appropriate?

c) State symbolically the null and alternative hypotheses.

d) Determine the degrees of freedom and the critical t value.

e) Calculate t

f) Based on the above information, would you reject H0, or fail to
reject it? Why? How would you state your conclusion in
words?

Answer #1

Assignment #6 Due Sunday by 11:55pm 1. The following 10 numbers
were drawn from a population. Is it likely that these numbers came
from a population with a mean of 13? Evaluate with a two-tailed
test at p < .05. 5, 7, 7, 10, 10, 10, 11, 12, 12, 13
a. State both in words, and then symbolically what your H1 and
H0 would be.
b. What is your df? What is your critical t?
c. Calculate t
d. Based...

The following 10 numbers were drawn from a population:
5 7 7 10 10 10 11 12 12 13
a) Calculate the 95% confidence interval for the population
mean
b) Is it likely that these numbers came from a population with a
mean of 13? Explain
c) Calculate t and decide to reject or fail to reject the null
hypothesis. mu=13 using a two-tailed test and at an alpha of
.05

1.
Test the hypothesis:
Population appears to be normally distributed.
Given the sample statistics n = 20, = 8.2, and s = 1.2,
find the critical value(s) tcr and
test statistic t for testing the claim μ = 8.6 at
significance α = 10%.
Then, state the conclusion of this hypothesis test.
Select one:
tcr = 1.729, t ≈ 1.491, fail to reject
H0
tcr = 1.328, t ≈ 1.491, reject H0
tcr = −1.328, t ≈ −1.491, reject H0
tcr...

A manufacturer of chocolate chips would like to know whether its
bag filling machine work correctly at the 420 gram setting. He
believed that the machine is underfilling or overfilling the bag. A
49 bag sample had a mean of 423 grams. Assume the population
variance is known to be 676. Is there sufficient evidence at the
0.02 level of significance that the bags are overfilled?
H0 =
Ha =
Test Statistic (round your answer to two decimal places): z...

t-test. Test the following claim about the population mean μ at
the given level of significanceα using the given sample statistics.
Assume that the population follows a normal distribution.
(1) State the null hypothesis, H0, and the alternate hypothesis,
Ha indicating which is the claim. You should also list the level of
significance, α and state the type of hypothesis test that must be
done (i.e. left-tailed, right-tailed, or two-tailed).
(2) Show your calculation of the test statistic.
(3) Depending...

When games were sampled from throughout a season, it was
found that the home team won 127 of 198 professional basketball
games and the home team won 57 of 99 professional football games.
At the 5% level of significance, does this indicate that there is a
significant difference between the proportion of home games won by
the two sports?
(1) List all the information necessary for conducting
the hypothesis test and state which
test you are doing.
(2) State the...

A sample is selected from a population with µ = 62.
After a treatment is administered to the individuals in the sample,
the mean is found to be M = 68 and the standard deviation
is s = 12.
A. Assume the sample has n = 9 scores
and compute a single sample t-test and the estimated Cohen's d
effect size. Based on your computed t test value, can
you reject H0 witha two-tailed test α = .05?
Write the appropriate...

Rasmussen College - STA3215 - Module 3 Homework
1. A formal hypothesis test is to be conducted using the claim
that the mean body temperature is equal to 98.6 degrees
Fahrenheit.
a. Identify the symbolic form of the null hypothesis.
b. Identify the symbolic form of the null hypothesis.
c. Is the test two-tailed, left-tailed or right-tailed?
Explain.
d. What possible conclusions can be made about the null
hypothesis?
e. After performing the hypothesis test, the p-value is found to...

Please show all
work:
Assignment:
You will be answering problems #1 - #4. For each problem, you will
need to complete parts A through F. Please make sure you answer
each part completely and you offer justification where
necessary. Do all work "by hand" (not using StatCrunch)
as good practice for your next exam!
A) Write the claim
mathematically and state the null and alternative hypotheses.
B) Determine whether
the hypothesis test is left-tailed, right-tailed, or two tailed and
whether...

Please show all work:
Assignment: You will be answering problems #1 - #4. For each
problem, you will need to complete parts A through F. Please make
sure you answer each part completely and you offer justification
where necessary. Do all work "by hand" (not using StatCrunch) as
good practice for your next exam!
A) Write the claim mathematically and state the null and
alternative hypotheses.
B) Determine whether the hypothesis test is left-tailed,
right-tailed, or two tailed and whether...

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