Download PSYC 815 QUIZ BASIC STATISTICS AND RESEARCH DESIGN and more Exams Advanced Education in PDF only on Docsity!
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Question 2
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PSYC 815 QUIZ BASIC STATISTICS AND RESEARCH
DESIGN
LIBERTY UNIVERSITY
An alternative hypothesis must include the anticipated direction of variance.
True
False
An a priori power analysis is important for which of the following reasons...
It helps in assessing the probability of making a Type II error
It determined the correct alpha level to use.
It tests the validity of the direction of the null hypothesis.
None of the above
A researcher provides one group of participants a therapy intervention and another group of participants a no treatment control condition and then testsfor a significant difference between the two groups means on a dependent measure of psychological adjustment after treatment. Which one of the statistics below would she use?
z -test
one sample t -test
independent t -test
dependent t -test
A measure of the square root of the total sum of squares divided by N -1 iswhich one of the following?
s amp l e vari a nce ( s^2 ) sample
mean ( M or )
sample standard deviation ( s )
sample median ( Mdn )
Degree to which a scale informs you of the construct being measured is called ; Discrepancy between what we’re measuring and the actual value of what we are measuring.
Validity; reliability
Level of Measurement; Measurement Error
Question 5
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Question 4
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IncorrectQuestion 9
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one sample t -test
independent t -test
dependent t -test
“Any measurable characteristic of a population” defines which one of thefollowing terms.
statistics
parameter
inference
central limit theorem
statistical inference
Theoretically, why is randomization so important?
Because we don't want a heterogeneous sample We
want to control the individuals characteristics
The random sampling creates natural IV and DV categories
IncorrectQuestion 8
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Question 10
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neutralizes other influences of the dependent variable
DEPRESSION STUDY INFO:
A group of researchers want to know if an experimental antidepressant medication that has been developed is effective in the treatment of depression with counseling compared to treatmentwithout this medication. A sample of 40 individuals is receiving services for depression in an outpatient clinic. The patients are randomly assigned to a treatment and a control condition. The treatment group patients will receive an experimental antidepressant medication with the counseling, while the control group will receive a placebo inert pill and counseling. Symptoms of depression using the Beck Depression Inventory (BDI) are comparedacross the two groups of patients after 8 weeks of treatment. Higher scores represent more depression.
Treatment Group Control Group Mean 29.400 33. Variance 8.884 14. Group Size 20 20
What is the independent variable in this research problem?
Beck Depression Inventory
depressive symptoms
treatment condition with experimental antidepressant
patients with depression
Question 14
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Question 15
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Degree of effect
Definition of variables
All of the above
If a researcher rejects the null hypothesis and in actual truth the null is true which one of the following is the best answer?
The researcher made a Type I error.
The researcher made a Type II error.
The researcher made a correct decision.
The researcher made both Type I and Type II errors.
If you were most concerned about avoiding making a Type I error you would choose an α = .10?
True
False
Question 17
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Question 18
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In addition to stating the results of the hypothesis tested, it is also important to report other information. Which one of the following choices is the bestanswer?
beta interval
effect size
confidence intervals
both a & b
both b & c
The alternative hypothesis is the hypothesis that is tested statistically.
True
False
The hypothesis testing process is the most widely used statistical tool in scientific research.
Question 16
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Question 22
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Educational researchers want to know if there is a difference between the type of instructional method used in high schoolchemistry courses.
Read the alternative hypothesis that is stated next. Then, answerthe questions that follow, which relate to the stated alternative hypothesis.
Alternative Hypothesis: High school chemistry students who participate in a standard chemistry curriculum that is augmented with intelligent computer- based chemistry tutors will demonstratehigher chemistry achievement, as measured by higher scores on astandardized achievement test, when compared to students receiving only the standard chemistry curriculum.
Researchers tested the null hypothesis related to the above stated alternative hypothesis by comparing the means of student achievement across the two chemistry curriculum conditions. The significant probability finding was p =. related to the difference between means and the alphacriterion is α = .05. Is it correct to say, we conclude that there is a significant difference in student chemistry achievement means among high school chemistry students across the two chemistry curriculum conditions, p < .05?
Yes
No
Which one of the following represents the way to state the narrative alternative hypothesis symbolically?
T he μ 1 ref ers to the po pul ation me an tha t is being es ti mate d on s cience (^) achievement of the students in the condition of the standard chemistry curriculum that is augmented with intelligent computer-based chemistry tuto^ rs^ and^ μ 2 ref^ ers^ to^ the po pul ation me a n tha t i s being es ti mate d on (^) science achievement of the students in the condition of the standard chemistry curriculum only.
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Question 24
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H 0 : μ 1 = μ 2
Ha : μ 1 < μ 2
Ha : μ 1 > μ 2
H 0 : μ 1 > μ 2
Ha : μ 1 ≠ μ 2
Which one of the following items best describes the independent variable in the alternative hypothesis stated above?
high school chemistry curriculum
science achievement
intelligent computer-based chemistry tutors
high school chemistry students
standard science curriculum
What one of the following items best describes the dependent variable in the alternative hypothesis stated above?
