Question

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:

1. The null and alternative hypotheses (.5 points per hypothesis)

2. The t statistic representing the critical region cutoff point (i.e., the t value you find using the t distribution table and df). (.5 points)

3. The value of the t test statistic and the value of r2. (.5 points for t and .5 points for r2)

4. Your decision about whether to reject the null hypothesis (you do not need to write an APA format statement). (.5 points)

Answer #1

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 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 =...

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 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 = 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...

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...

Dr. Calvin Broadus wants to determine whether marijuana
influences anxiety. He draws a sample of n = 16 individuals. The
population from which they were selected exhibit a score of µ = 30
on an anxiety measure. After “treatment” is administered to the
individuals, the sample mean is found to be M = 33 and the
sample variance is s2 = 64.
Is this a one-tailed or two-tailed test?
One-tailed
Two-tailed
If the researcher decides to test at the α...

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 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 =...

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