Question

A researcher selects a sample of *n* = 100 from a normal
population with *µ* = 50 and *σ* = 30. If the
treatment is expected to decrease scores by 10 points, what is the
power of a two-tailed hypothesis test using *α* = .05?

Answer #1

A researcher selects a sample of sixteen individuals from a
normal population with a mean of µ = 40 and σ = 8. A treatment is
administered to the sample and, after treatment, the sample mean is
43. If the researcher uses a hypothesis test to evaluate the
treatment effect, what z-score would be obtained for this
sample (z-test value obtained)?
Does the scenario Question #1 described a directional test?
What would be the critical value for comparison? (Use α...

A normal population has a mean of µ = 100. A sample of n = 36
is selected from the population, and a treatment is administered to
the sample. After treatment, the sample mean is computed to be
M = 106. Assuming that the population standard deviation
is σ = 12, use the data to test whether or not the treatment has a
significant effect. Use a one tailed test.
Hypothesis:
Zcrit =
z test
calculation:
Conclusion:

A random
sample is selected from a normal population with a mean of µ = 30
and a standard deviation of σ= 8. After a treatment is administered
to the individuals in the sample, the sample mean is found to be x̅
=33.
Furthermore,
if the sample consists of n = 64 scores, is the sample
mean sufficient to conclude that the treatment has a significant
effect? Use a two-tailed test with α = .05.
4a. Which of
the following...

Some researchers claim that herbal supplements improve human
memory. To test this claim, a researcher selects a sample of n = 25
college students. Each student is given herbal supplements daily
for 6 weeks and then all the participants are given a standardized
memory test. For the population, scores on the tests are normally
distributed with µ = 70 and σ= 20. The sample of n = 25 students
had a mean score of M = 80. Can we conclude...

A sample of n = 4 is selected from a population with µ = 50.
After a treatment is administered to the individuals in the sample,
the mean is found to be M = 55 and the variance is s2 = 64. Conduct
a one-sample t-test to evaluate the significance of the treatment
effect and calculate r2 to measure the size of the treatment
effect. Use a two-tailed test with α = .05. In your response, make
sure to state:...

A sample of students is selected from a population with
µ = 50. After a treatment is administered to the
individuals in the sample, the mean is found to be M = 55 and the
variance is s2 = 64.
If the sample has n = 16 scores, then conduct a
hypothesis test to evaluate the significance of the treatment
effect.
Use a two-tailed test with α = .05.
What are the Hypotheses?
What is the df?
What is the...

A random sample is selected from a normal population
with a mean of μ=50 and a standard deviation of σ=12. After a
treatment is administered to the individuals in the sample, the
sample mean is found to be M=55.
a. If the sample consists of n=16 scores, is the sample
mean sufficient to conclude that the treatment has a significant
effect? Use a two-tailed test with α =0.05. b. If the sample
consists of n=36 scores, is the sample mean...

A sample of n=18 individuals is selected from a population with
a mean of µ=77, and a treatment is administered to the individuals
in the sample. A treatment is administered to the individuals in
the sample and after treatment, the sample variance is found to be
s2=144.
a. If the treatment has a 3-point effect and produces a sample mean
of M=80, is this sufficient to conclude that there is a significant
treatment effect effect using a two-tailed test with...

A sample of n = 16 individuals is selected from a population
with µ = 30. After a treatment is administered to the individuals,
the sample mean is found to be M = 33. We do not know the
population standard deviation.
A. If the sample variance is
s2 = 16, then calculate the estimated standard
error and determine whether the sample is sufficient to conclude
that the treatment has a significant effect? Use a two-tailed test
with α =...

A sample of n = 16 individuals is selected from a population
with µ = 30. After a treatment is administered to the individuals,
the sample mean is found to be M = 33. We do not know the
population standard deviation.
A. If the sample variance is
s2 = 16, then calculate the estimated standard
error and determine whether the sample is sufficient to conclude
that the treatment has a significant effect? Use a two-tailed test
with α =...

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