Question

The mean height of adult males in the U.S is about 68.2" with a
variance of 16.00". Suppose the mean height of a sample of 30
mentally disabled males was found to be 69.6". Researchers want to
know if the height of mentally disabled males differs from the
population. What can be concluded with α = 0.01?

**a)** What is the appropriate test statistic?

---Select from the options--- na z-test, one-sample t-test,
independent-samples t-test, related-samples t-test

**b)**

Population:

---Select from the options--- height, mean height, mentally
disabled males, population, U.S. males

Sample:

---Select from the options--- height, mean height, mentally
disabled males, population, U.S. males

**c)** Compute the appropriate test statistic(s) to
make a decision about *H*_{0}.

(Hint: Make sure to write down the null and alternative hypotheses
to help solve the problem.)

critical value = ; test statistic =

Decision: ---Select from the options--- Reject H0 Fail
to reject H0

**d)** If appropriate, compute the CI. If not
appropriate, input "na" for both spaces below.

[ , ]

**e)** Compute the corresponding effect size(s) and
indicate magnitude(s).

If not appropriate, input and select "na" below.

*d* = ; ---Select from the options--- na,
trivial effect, small effect, medium effect, large effect

*r*^{2} = ; ---Select from the
options--- na, trivial effect, small effect, medium effect, large
effect

**f)** Make an interpretation based on the
results.

The mentally disabled males are significantly taller than males in the U.S.

The mentally disabled males are significantly shorter than males in the U.S.

The height of mentally disabled males does not significantly differ from males in the U.S.

Answer #1

Application Exercise:
A physician hypothesizes that males have higher systolic blood
pressure than females. The physician obtains a sample of patients
and measures their blood pressures during their regular check-up.
Below is the systolic blood pressure for the sample. What can the
physician conclude with α = 0.01?
male
female
106
119
98
105
100
132
109
113
98
105
137
115
119
115
127
122
131
124
111
136
a) What is the appropriate test statistic?
---Select--- na z-test...

A doctor hypothesizes that females have higher systolic blood
pressure than males. The doctor obtains the blood pressure from a
sample of patients during their annual check-up. Below is the
systolic blood pressure for the sample. What can be concluded with
α = 0.05?
male
female
106
119
98
105
100
132
109
113
98
105
137
105
119
115
127
122
131
124
111
136
a) What is the appropriate test statistic?
---Select--- na z-test One-Sample t-test Independent-Samples t-test...

Generally, the average typing speed is 56 words per minute (wp).
A professor wanted to see where his students stand compared to the
population. He tested 24 of his students and obtained the following
estimates: an average typing speed of 58 with a variance of 361.00.
What can the professor conclude with α = 0.01?
a) What is the appropriate test statistic?
---Select--- na z-test One-Sample t-test Independent-Samples t-test
Related-Samples t-test
Also state population and sample from choices below
Population:...

A sample obese adult males were randomly divided into two groups
in a lifestyle change program. In the experimental group,
participants were involved in a vigorous 20-minute-per-day exercise
program and also given instructions on the importance of diet. The
control group only received the diet instructions. The hospital
administrators predict that exercise plus diet instruction will
reduce LDL cholesterol levels. Below are the LDL cholesterol data
after two months in the program. What can be concluded with α =
0.10?...

A sociologist wants to know about the stress levels in the
nation over the past years. In the late 1990s, the average score on
the Brown's Stress Inventory (BSI) in the nation was 18 with a
variance of 51.84. A current day sample of 21 produces a mean BSI
score of 18.5. What can the sociologist concludes with an α of
0.01?
a) What is the appropriate test statistic?
---Select--- na z-test one-sample t-test independent-samples t-test
related-samples t-test
b)
Population:...

A sociologist wants to know about the stress levels in the
nation over the past years. In the late 1990s, the average score on
the Brown's Stress Inventory (BSI) in the nation was 18 with a
variance of 51.84. A current day sample of 21 produces a mean BSI
score of 18.5. What can the sociologist concludes with an α of
0.01?
a) What is the appropriate test statistic?
---Select--- na z-test one-sample t-test independent-samples t-test
related-samples t-test
b)
Population:...

Application Exercise:
In a fast food company, all male employees with 3 to 5 years of
experience have an average salary of $27900 with a with a standard
deviation of $5090. A random sample of 27 female employees also
having 3 to 5 years of experience had an average salary of $27200.
The company accountant suspects a different in salary practices for
males and females. What can be concluded with an α of
0.10?
a) What is the appropriate test...

A political scientist hypothesizes that a political ad will
reduce attitudes about a particular issue. The scientist randomly
asks 31 individuals walking by to see the ad and then take a quiz
on the issue. The general public that knows little to nothing about
the issue, on average, scores 50 on the quiz. The individuals that
saw the ad scored an average of 53.59 with a variance of 25.70.
What can the political scientist conclude with an α of 0.05?...

A school psychologist wants to know if a popular new hypnosis
technique impacts depression. The psychologist collects a sample of
14 students and gives them the hypnosis once a week for two months.
Afterwards the students fill out a depression inventory in which
their average score was 43.04. Normal individuals in the population
have a depression inventory average of 49 with a variance of
144.00. What can the psychologist conclude with an α of 0.01?
a) What is the appropriate...

Vita Pills were advertised as having 751 mg of vitamin B3 per
pill. A marketing firm hypothesizes that the amount of vitamin B3
is less than what is advertised. What can be concluded with α =
0.10. The vitamin B3 content per pill from a sample of pills is as
follows:
713, 761, 716, 721, 751, 721, 711, 741.
a) What is the appropriate test statistic?
---Select--- na z-test One-Sample t-test Independent-Samples t-test
Related-Samples t-test
b)
Population:
---Select--- sample of...

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