Question

A treatment is administered to a sample selected from a
population with a mean of μ=40 and a variance of σ^{2}=36.
After treatment, the sample mean is *M*=45. Based on this
information, calculate Cohen’s d and state the effect size.

Answer #1

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
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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 random sample is selected form a normal population with a mean
of μ = 40 and a standard deviation of σ = 10. After a treatment is
administered to the individuals in the sample, the sample mean is
found to be M = 46.
a. How large a sample is necessary for this sample mean to be
statistically significant? (Assume a two-tailed test with α =
0.05)
b. If the sample mean were M = 43, what sample size...

A sample is selected from a population with mean score of 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.
A. Assume that the sample has n = 4 scores. Conduct a hypothesis
test to evaluate the significance of the treatment effect and
calculate Cohen’s d to measure the size of the treatment effect.
Use a two-tailed test with...

A sample is randomly selected from a population with a mean of μ
= 50, and a treatment is administered to the individuals in the
sample. After treatment, the sample is found to have a mean of M =
56 with a standard deviation of s = 8. If there are n = 4
individuals in the sample, are the data sufficient to reject Ho and
conclude that the treatment has a significant effect using a
two-tailed test with =...

A sample is selected from a population with µ = 50. After
treatment is administered, we find top enclose x = 55 and sigma2 =
64. a. Conduct a hypothesis test to evaluate the significance of
the treatment effect if n = 4. Use a two-tailed test with α = .05.
If it is significant, how large is the effect (Cohen’s d)? b.
Keeping all else equal, re-evaluate the significance if the sample
had n = 16 participants. If it...

A
random sample is selected from a normal population with a mean of μ
= 20 and a standard deviation of σ =5 10. After a treatment is
administered to the individuals in the sample, the sample mean is
found to be M = 25. If the sample consists of n = 25 scores, is the
sample mean sufficient to conclude that the treatment has a
significant effect? Use a two-tailed test with alpha =
.05.

A sample of n=9 individuals is selected from a population with a
mean of μ=10. A researcher suspects that after the individuals have
gone through a specific type of treatment, their performances on a
standardized examination will be different from the general
population. After the treatment, the sample has a M=13 and
s2=9.
1. Using symbols, state the hypothesis for a two-tailed
test.
2. Calculate the t statistic and place this on a standardized
normal distribution.
3. With a two-tail...

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...

A random sample is selected from a normal popula-tion with a
mean of μ = 40 and a standard deviation of σ = 10. After a
treatment is administered to the individuals in the sample, the
sample mean is found to be M = 46.
How large a sample is necessary for this sample mean to be
statistically significant? Assume a two-tailed test with alpha =
.05.

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