Question

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 30 of his students and obtained the following estimates: an average typing speed of 49 with a standard deviation of 16. What can the professor conclude with α = 0.01?

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/or select "na" below.

*d* = ; ---Select--- na trivial
effect small effect medium effect large effect

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

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

Student typing speed is significantly higher than average.The average typing speed is significantly higher than student typing speed. Student typing speed did not significantly differ from the average.

Answer #1

e)

In this problem we should do t-test for single mean. Values for
'd' or 'r^{2} ' are taken to be considered when we test
significance of difference of two sample means.

For the independent samples T-test, **Cohen's d**
is determined by **calculating** the mean difference
between your two groups, and then dividing the result by the pooled
standard deviation. **Cohen's d** is the appropriate
**effect size measure** if two groups have similar
standard deviations and are of the same **size**.

Hence, for this problem d = NA and r^{2} = NA.

f)

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:...

Generally, the average typing speed is 54 words per minute (wp).
A professor wanted to see where his students stand compared to the
population. He tested 28 of his students and obtained the following
estimates: an average typing speed of 46 with a standard deviation
of 18. 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
b)
Population:
---Select--- the professor typing speed average...

A school psychologist believes that a popular new hypnosis
technique increases depression. The psychologist collects a sample
of 23 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 49.21. Normal individuals in the
population have a depression inventory average of 49 with a
variance of 121.00. What can the psychologist conclude with an α of
0.01?
a) What is the appropriate test statistic?...

Peach Tree University (PTU) coaches want to know if Victorville
University's (VU's) offensive line weighs different than their
offensive line. The weight of randomly selected offensive line
players from each team are below. What can the coaches conclude
with α = 0.01?
PTU
VU
309
297
310
285
295
321
312
310
308
309
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...

Boys of a certain age in the nation have an average weight of 86
with a standard deviation of 9.6 lb. A complaint is made that boys
are overfed in a municipal children's home. As evidence, a sample
of 29 boys of the given age is taken from the children's home with
an average weight of 85.14 lb. What can be concluded with α =
0.01?
a) What is the appropriate test statistic?
---Select--- na z-test One-Sample t-test Independent-Samples t-test...

Children of a certain age in the nation have an average weight
of 86 with a variance of 92.16 lb. A complaint is made that
children are overfed fed in a municipal children's home. As
evidence, a sample of 24 children of the given age is taken from
the children's home with an average weight of 89.65 lb. What can be
concluded with an α of 0.05?
a) What is the appropriate test statistic?
---Select one--- (na, z-test, one-sample t-test,...

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...

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...

A social psychologist predicts that college students will be
impaired from a self-efficacy program for professional athletes. A
sample of students is drawn from a university whose students have
an average of 54 for self-efficacy. The sample of students goes
through the program for six weeks and afterwards are given a
self-efficacy questionnaire. What can the psychologist conclude
with an α of 0.01? The self-efficacy scores for the sample after
six weeks are:
50, 61, 80, 46, 94, 66, 76,...

A social psychologist predicts that college students will
benefit from a self-efficacy program for professional athletes. A
sample of students is drawn from a university whose students have
an average of 54 for self-efficacy. The sample of students goes
through the program for six weeks and afterwards are given a
self-efficacy questionnaire. What can the psychologist conclude
with an α of 0.01? The self-efficacy scores for the sample after
six weeks are:
50, 61, 80, 46, 94, 51, 37, 85,...

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