QUESTION 1 The correlation between the two variables of interest is .081, which
ID: 3228386 • Letter: Q
Question
QUESTION 1
The correlation between the two variables of interest is .081, which is significant at the .637 level. That means ______.
The null hypothesis is rejected.
The research hypothesis is accepted.
The null hypothesis is accepted.
It cannot be determined.
2 points
QUESTION 2
You would like to examine the association between temperature and frozen yogurt sales. You hypothesize that higher temperatures will be associated with increased frozen yogurt sales. You have a _______.
one-tailed hypothesis
two-tailed hypothesis
nondirectional hypothesis
invalid hypothesis
2 points
QUESTION 3
Statistically significant correlations cannot show _______.
the probability level
the size of the effect
causality
the strength of the effect
2 points
QUESTION 4
If a research hypothesis does not predict the direction of a relationship, the test is _______.
one tailed
two tailed
direct
positive
2 points
QUESTION 5
If the hypothesis shows no direction, what type of correlation coefficient should we use?
partial correlation
absolute value
one tailed
two tailed
2 points
QUESTION 6
When computing a correlation coefficient, if you have 55 degrees of freedom, your sample size must be _______.
55
53
56
57
2 points
QUESTION 7
A professor hypothesizes that there will be a positive relationship between couples’ listening skills and length of marriage. She has a _______.
one-tailed hypothesis
invalid hypothesis
valid hypothesis
two-tailed hypothesis
2 points
QUESTION 8
What does the statement rxy ¹ 0 represent?
null hypothesis
t statistic
mean difference
research hypothesis
2 points
QUESTION 9
Correlation coefficients examine ______.
differences between two groups
differences between two or more groups
the relationship between variables
how variables can be arranged into higher-order factors
2 points
QUESTION 10
If you posit that a relationship between two variables will be either positive or negative, what type of test should you use?
two tailed
ANOVA
one tailed
Cohen’s d
2 points
QUESTION 11
If a research hypothesis posits that there is a direct relationship between two variables, the test is _______.
one tailed
two tailed
negative
nondirectional
2 points
QUESTION 12
In the equation r(65) = .45, p < .05, what is the obtained value?
.45
45
.65
65
2 points
QUESTION 13
What is another term for a negative correlation?
indirect
nondirectional
direct
unidirectional
2 points
QUESTION 14
Correlation coefficients can test _______ variable(s) at a time.
only one
only two
one or more
two or more
2 points
QUESTION 15
In the equation r(65) = .45, p < .05, what does r represent?
observed statistic
experimental statistic
test statistic
critical statistic
2 points
QUESTION 16
In the equation r(65) = .45, p < .05, what are the degrees of freedom?
.45
45
.65
65
2 points
QUESTION 17
What is another term for an indirect correlation?
negative
nondirectional
positive
unidirectional
2 points
QUESTION 18
In the formula for calculating degrees of freedom for a correlation coefficient, what does the n represent?
sample size
number of groups
number of pairs
population
2 points
QUESTION 19
Which of the following indicates a very significant correlation?
p = .05
p < .05
p < .01
p < .50
2 points
QUESTION 20
If a research hypothesis posits that there is a nondirect relationship between two variables, the test is _______.
one tailed
two tailed
negative
nondirectional
2 points
QUESTION 21
The correlation between the two variables of interest is .81, which is significant at the .0337 level. That means ______.
The null hypothesis is rejected.
The research hypothesis is accepted.
The null hypothesis is accepted.
It cannot be determined.
2 points
QUESTION 22
What is the name of the Greek letter r?
phi
rho
chi
alpha
2 points
QUESTION 23
Which of the following is another use of correlation coefficients?
testing mean differences
testing causal relationships
estimating reliability
estimating power
2 points
QUESTION 24
If a research hypothesis predicts the direction of a relationship, the test is _______.
one tailed
two tailed
direct
positive
2 points
QUESTION 25
When computing the correlation coefficient, the _______ between variables, not the _______ between groups, is being examined.
relationship; difference
difference; relationship
means, reliability
reliability; means
2 points
QUESTION 26
The level of risk or Type I error typically set for testing the level of significance of a correlation coefficient is which of the following?
.01
.05
.95
.99
2 points
QUESTION 27
Which of the following represents the test statistic for a correlation coefficient?
t
r
j
F
2 points
QUESTION 28
While you can use the correlation coefficient as its own test statistic, what is the other appropriate test statistic often used to examine the significance of a correlation?
F-test
Cohen’s d
t-test
h2
2 points
QUESTION 29
If a simple Pearson correlation value = .512, what percentage of variance is accounted for?
26%
49%
51%
74%
2 points
QUESTION 30
If the accounted variance is 24.2%, what is the correlation between the two variables?
24.6%
49.2%
50.4%
75.4%
The null hypothesis is rejected.
The research hypothesis is accepted.
The null hypothesis is accepted.
It cannot be determined.
Explanation / Answer
QUESTION 1
The correlation between the two variables of interest is .081, which is significant at the .637 level. That means the null hypothesis is rejected
QUESTION 2
You would like to examine the association between temperature and frozen yogurt sales. You hypothesize that higher temperatures will be associated with increased frozen yogurt sales. You have a one tailed test
QUESTION 3
Statistically significant correlations cannot show casuality
QUESTION 4
If a research hypothesis does not predict the direction of a relationship, the test is two tailed
Please post rest of the questions in qnother query with 4 questions only
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