Question

Show all your work. Indicate clearly the methods you use, because you will be scored on the correctness of your methods as well as on the accuracy and completeness of your results and explanations.

A bank categorizes its customers into one of three groups based on their banking habits. A random sample of 30 customers from each group was selected, and the number of times each customer visited the bank during the past year was recorded. The following table shows the summary statistics.

Groups | n | x-bar | s |

A | 30 | 48 | 7 |

B | 30 | 51 | 8 |

C | 30 | 54 | 10 |

The bank manager will investigate whether there is a significant
difference in mean numbers of bank visits for the groups. Multiple
two-sample *t*-tests will be conducted, each at the
significance level of *α*=0.05.

The significance level
(*α*) of a single hypothesis test is the probability of
making a Type I error. The manager wants to know the probability of
making a Type I error for multiple *t*-tests, not just for a
single *t*-test. This probability is called the family error
rate for Type I error, which is also known as the family error
rate.

Question 4

(d) The manager wants
the family error rate to be close to 0.05. Suggest a single
significance level *α* that could be used for all of the
individual *t*-tests that will bring the family error rate
close to 0.05. Show work to support your suggested level.

Answer #1

Show all your work. Indicate clearly the methods you use,
because you will be scored on the correctness of your methods as
well as on the accuracy and completeness of your results and
explanations. A recent survey collected information on television
viewing habits from a random sample of 1,000 people in the United
States. Of those sampled, 37 percent indicated that their favorite
sport to watch on television was American football.
(a) Construct and interpret a 95 percent confidence interval...

Please read
carefully. You must show all of your work for full
credit. A correct answer with no work shown is worth no
points, but an incorrect or partial answer with some work shown may
be worth partial credit
I. The following
ANOVA are from an experiment designed to investigate the perception
of corporate ethical values among individuals specializing in
marketing.
Anova: Single Factor
SUMMARY
...

Excluding multiple t-tests, all other multiple comparison
procedures, such as post-hoc comparisons:
Select one:
a. Inflate α
b. Inflate β
c. Divide α in half.
d. Maintain the probability of a Type I error at the desired
level originally set.

Question 4 please although I am unsure of my answers for the
rest as well :(
Here is the full list for background info.
Consider a significance test for a null hypothesis versus a
two-sided alternative. State all values of a standard normal test
statistic z that will give a result significant at the 10%
level but not at the 5% level of significance. (Sec. 6.2)
You perform 1,000 significance tests using α = 0.01.
Assuming that all the null...

For any mathematical computations, you must show your work to
receive full credit.
1. In your own words, how is a null hypothesis, different from a
research hypothesis?
2. A statistician is faced with increasing the chances that she
will make a Type I error or increasing the chances that she will
make a Type II error. What advice do you give to her? Why?
3. Discuss how the terms “level of significance” and “critical
region” are related.
4. Why...

In 2006, a study was conducted to compare two methods for
assisting people experiencing trouble breathing as a result of an
airway blockage. In Pittsburg, 350 patients were assigned randomly
to one of two treatments: 150 to treatment 1 and 200 to treatment
2. A total of 250 patients survived the obstruction: 95 in the
group receiving treatment 1 and 155 in the group receiving
treatment 2. A test of significance was conducted on these
hypotheses:
H0: The survival rates...

You may need to use the appropriate appendix table or technology
to answer this question.
Consider the following hypothesis test.
H0: μ ≥ 10
Ha: μ < 10
The sample size is 130 and the population standard deviation is
assumed known with σ = 5.Use α = 0.05.
(a) If the population mean is 9, what is the probability that
the sample mean leads to the conclusion do not reject
H0? (Round your answer to four decimal
places.)
(b) What...

Use the following macroeconomic model to answer the questions
from. You must show your work of estimation to obtain the
credits.
C = 50 + 0.80Yd; C = consumption function; Yd = disposable
income (Y-T)
T = 30; T = Tax revenue
I = 100; I = Investment
G = 150; G = Government expenditure
Yf = Full Employment RGDP (Potential RGDP) = 1600
1. Estimate the equilibrium GDP level (income).
2. At the equilibrium level of output you estimated...

manufacturer of batteries wanted to test the longevity of
one-time-use and rechargeable batteries. Employees who work in the
research and development department created 10 different pairs of
battery, making one of each type. Then they put the batteries under
a performance test and measured the time it took for them to fail.
Assume that the populations are normally distributed.
The manufacturer tests the paired data, where α=0.05, in
order to evaluate the claim that the true mean difference in times...

In the book Business Research Methods, Donald R. Cooper
and C. William Emory (1995) discuss a manager who wishes to compare
the effectiveness of two methods for training new salespeople. The
authors describe the situation as follows:
The company selects 22 sales trainees who are randomly divided into
two equal experimental groups—one receives type A and the
other type B training. The salespeople are then assigned
and managed without regard to the training they have received. At
the year’s end,...

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