Question

A researcher is interested in the relationship between one’s satisfaction with pay (X) and one’s commitment to the organization (Y). The researcher collects data from 24 employees and finds that the correlation between the two variables is r = 0.22.

a. State the null hypothesis.

b. Identify the appropriate statistical test

c. Calculate the appropriate test statistic. Make sure to report the degrees of freedom for the statistical test (if appropriate). You must show your work to receive full credit.

d. State your conclusions (use a two-tailed test with = .05 for all tests).

e. Compute an effect size.

Answer #1

A researcher is interested in the relationship between one’s
satisfaction with pay (X) and one’s commitment to the organization
(Y). The researcher collects data from 24 employees and finds that
the correlation between the two variables is r = 0.22.
e. Compute an effect size.

A researcher knows that the weights of 6 year olds are
normally distributed with μ = 20 kg and
σ = 5.0. She suspects that children in poverty-stricken
regions differ from the population. With a sample of n = 25
children, the researcher obtains a mean of 17
kg.
a. State the null hypothesis.
b. Identify the appropriate statistical test
c. Calculate the appropriate test statistic. Make sure to report
the degrees of freedom for the statistical test (if appropriate)....

Annabelle is a student at U of A. She is interested in the
relationship between agreeableness and job performance for
salespeople. She collects data and finds a statistically
significant correlation between the two variables, r =
-0.36, r2 = 0.13. Please explain her findings.
Can you make a conclusion about the causal relationship between the
two variables?

A researcher is interested in the relationship between
concussions and short-term memory loss. To explore this
relationship, the researcher collects data on the number of
concussions and number of words recalled on a memory test.
Assume SP = -34
SSconcussions =
58 SSnumber of words
recalled = 27
Interpret the Pearson correlation coefficient between
concussions and number of words recalled in terms of the strength
and direction of the relationship:

A researcher is interested in assessing the relationship between
depression and anxiety. A group of individuals completed a
depression inventory and an anxiety questionnaire. Higher scores on
both assessments indicate a higher level of depression or anxiety.
Test the relationship between these scores using a two-tailed test,
α=.05. What is the verbal research hypothesis (H1)?
a. Neuroticism scores and hours spent on Instagram daily are
linearly related; the correlation is not zero.
b. Neuroticism scores and hours spent on Instagram...

You are a biomedical researcher and you want to know if the
consumption of alcohol during
pregnancy affects the birthweight of
babies. You know that the average birthweight for babies in the
U.S. is m = 7.5 pounds. You draw a random sample of 16 infants
whose mothers indicated that they regularly consumed alcohol during
pregnancy. The sample had a mean of 6.50 and a standard deviation
of 1.50.
a.
State the null hypothesis.
b.
Identify the appropriate statistical test...

a.
State the null hypothesis.
b.
Identify the appropriate statistical test
c.
Calculate the appropriate test statistic. Make sure to report the
degrees of freedom for the statistical test (if appropriate). You
must show your work to receive full credit.
d.
State your conclusions (use a two-tailed test with a = .05 for all
tests).
e.
Compute an effect size.
A researcher knows that the weights of 6 year olds are normally
distributed with m = 20 kg and s...

A researcher examined the relationship between sleep hours and
stress levels among NYC students. He studied 10 participants. He
found that r-statistics is r = .620. What is his conclusion? Use
alpha level = .05 Two-tailed test.
*Failed to reject the null hypothesis and conclude that there is
no relationship between the two variables.
*Reject the null hypothesis and conclude that there is no
relationship between the two variables.
*Reject the null hypothesis and conclude that there is a
relationship...

In conducting a study to examine the
relationship between (1) undergraduate students’
satisfaction with a finite mathematics course and (2) other
variables, including students’ interest and
anxiety and the instructor’s perceived
enthusiasm, the researcher found the following correlation
coefficients:
Pearson Correlation Coefficients
Instructor’s Enthusiasm
Interest
Anxiety
Students’
Satisfaction
.13
.78*
–.38*
* p<.05
Write a sentence to describe the following relationships (answer
questions 5.1 to 5.2):
(5.1) Relationship between
students’ satisfaction and instructor’s
enthusiasm? [5]
(5.2) ...

A researcher was interested in the relationship between the
reported stress level (variable X) and performance on memory test
(variable Y).
The data collected on a sample of n =
62 undergraduate students produced the following
results: MX = 4, SSx = 30,
MY = 6, SSY= 90, and
SP = - 15
A. Is there a significant correlation between
stress level and memory performance? Assume 2-tailed test,
p < .05. For full credit your answer should
include:
Null and alternative...

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