Question

Suppose that the national average population mean score on a Depression index taken one year after a traumatic event is 71.4. A psychologist takes a random sample of 90 patients who have been receiving a new type of therapy in response to a traumatic event. Their scores on the Depression index taken one year after the traumatic event have a sample mean of 65.2 and a sample standard deviation of 14.8. Does the population mean Depression index score for patients receiving the new therapy differ from national average? Conduct a hypothesis test with α=.05. Show all work.

Can you also explain how you got the p value

Answer #1

=71.4, n=90, = 65.2, s=14.8, =0.05

Ho: = 71.4

H1: 71.4

Formula for test statistics is

t= -3.9742

now calculate t critical value using t table with

Df= n-1 = 90-1=89 and =0.05

We get critical value as

Critical value= (-1.987, 1.987)

Now we observe that,

(Test statistics=-3.9742) < (critical value= -1.987)

Thus, test statistics lies in rejection region

Hence we **reject** **null**
**hypothesis**.

Therefore there is sufficient evidence to claim that the mean Depression index score for patients receiving the new therapy differ from national average.

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...

The health of the bear population in Yellowstone National Park
is monitored by periodic measurements taken from anesthetized
bears. A sample of 36 bears has a mean weight of 188.5 lb. At α =
.05, can it be concluded that the average weight of a bear in
Yellowstone National Park is different from 187 lb? Note that the
standard deviation of the weight of a bear is known to be 8.1 lb.
(a) Find the value of the test statistic...

The population IQ score was collected from a national-wide test.
The mean population IQ score is 101 and with a stand deviation of
15. The data of original population follows the normal
distribution.
Use the Z-score table provided to answer the following
questions:
(1) What is the Z score for IQ score = 95?
Answer: (Please report your answer to 3 decimal
places.)
(2) What is the Z score for IQ score = 110?
Answer: (Please report your answer to 3 decimal...

Four students reported their study time and test score from a
statistics course and their data have been converted into Z scores
in the table below. What is Pearson's correlation coefficient from
this data set?
Group of answer choices
a.)-.50
b.)-.25
c.).75
d.)-1.00
In what situation would a researcher use
a t-test used instead of a Z-test?
Group of answer choices
a.)When there is only one sample.
b.)When the population standard deviation is unknown.
c.)When the sample size is smaller than...

A swimming school claimed that the average seven-year-old would
be able to swim across an Olympic-sized pool in less than 120
seconds after taking lessons from their instructors. To test this
claim, a consumer psychologist arranged for eight randomly selected
seven-year-old children to take lessons at the school and recorded
how long it took each child to swim across a pool at the end of the
lessons [sample mean (M) = 95, and estimated population variance
(S2) = 600]. Using...

1.The sample mean is an unbiased estimator for
the population mean. This means:
The sample mean always equals the population mean.
The average sample mean, over all possible samples, equals the
population mean.
The sample mean will only vary a little from the population
mean.
The sample mean has a normal distribution.
2.Which of the following statements is
CORRECTabout the sampling distribution of the
sample mean:
The standard error of the sample mean will decrease as the
sample size increases....

What Statistical Test Should I Use
Please indicate the type of test needed to analyze the data
described.
Hints: Think about the IV and DV. How many levels of
the IV? Are they repeated measures? Are the data
categorical?
A. z-test
B. One-Sample t-Test
C. Dependent Measures t-Test
D. Independent Measures t-Test
E. One-way ANOVA
E. One-way ANOVA
F. Post-hoc tests
G. Between-Subjects Factorial ANOVA
H. Chi-Square test of Independence
________ 1. Compare spatial task scores after 0 or 3 drinks....

________ client-centered therapy centers on the patient's goals
and ways of solving problems.
Select one:
a. Rogers'
b. Freud's
c. Beck
d. Ellis
Question 2
Not yet answered
Points out of 1.00
Flag question
Question text
A frequently prescribed drug therapy for managing one's
depression is ____________.
Select one:
a. Adderall
b. Lithium
c. Prozac
d. Thorazine
Question 3
Not yet answered
Points out of 1.00
Flag question
Question text
A major goal of modern inpatient psychiatric treatment is:
Select...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 42 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago