Time to Practice Week Three
PSYCH/625 Version 1
1
University of Phoenix Material
Time to Practice Week Three
Complete both Part A and Part B below.
Part A
Some questions in Part A require that you access data from Statistics for People Who (Think They) Hate
Statistics. This data is available on the student website under the Student Test Resources link.
1. For the following research questions, create one null hypothesis, one directional research
hypothesis, and one nondirectional research hypothesis.
a. What are the effects of attention on out-of-seat classroom behavior? Null-There are no effects of
attention on out of seat classroom behavior. Nondirectional- Attention affects out-of-seat
classroom behavior. Directional- No attention negatively instigates out-of-seat classroom
behavior.
b. What is the relationship between the quality of a marriage and the quality of the spouses
relationships with their siblings? Null- There is no relationship between the quality of marriage
and the quality of the spouses relationship with their siblings. Nondirectional- The quality of a
marriage is effected by the quality of the spouses relationship with their sibling. Directional- The
quality of a marriage is dependent on the quality of the spouses relationship with their siblings.
c.
What is the best way to treat an eating disorder? Null- There is no way to treat an eating disorder.
Nondirectional- There are many ways to treat an eating disorder. Directional- There is one reliable
way to treat an eating disorder.
2. Provide one research hypothesis and an equation for each of the following topics:
a.
The amount of money spent on food among undergraduate students and undergraduate
student-athletes. Hypothesis- There is a difference between the amount of money spent on food
among undergraduate students and undergraduate student-athletes. Equation H1: X us X usa
b. The average amount of time taken by white and brown rats to get out of a maze. Hypothesis- The
average time for white rats to get out of a maze will be faster than brown rats to get out of a maze.
H1: X w X b
c. The effects of Drug A and Drug B on a disease. Hypothesis- Drug A has a less positive effect on a
drug as Drug B. H1: X da X db
b. The time to complete a task in Method 1 and Method 2. Hypothesis- It is faster to complete task 1
than it is to complete task 2. H1: X t1 X t2
3. Why does the null hypothesis presume no relationship between variables? The null hypothesis
presumes no relationship because it is the starting point and in the absence of other data is
presumed to be true.
4. Create a research hypothesis tested using a one-tailed test and a research hypothesis tested
using a two-tailed test.
One tailed:
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Time to Practice Week Three
PSYCH/625 Version 1
2
Two tailed:
5. What does the critical value represent? A critical value represents the value you would assume
the test statistic to produce if the null hypothesis was true.
6. Given the following information, would your decision be to reject or fail to reject the null
hypothesis? Setting the level of significance at .05 for decision making, provide an explanation for
your conclusion.
a.
The null hypothesis that there is no relationship between the type of music a person
listens to and his crime rate (p < .05).
b.
The null hypothesis that there is no relationship between the amount of coffee
consumption and GPA (p = .62).
c.
The null hypothesis that there is a negative relationship between the number of hours
worked and level of job satisfaction (p = .51).
7. Why is it harder to find a significant outcome (all other things being equal) when the research
hypothesis is being tested at the .01 rather than the .05 level of significance?
8. Why should we think in terms of failing to reject the null rather than just accepting it?
9. When is it appropriate to use the one-sample z test?
10. What similarity does a z test have to a simple z or standard score?
11. For the following situations, write out a research hypothesis:
a.
Bob wants to know if the weight loss for his group on the chocolate-only diet is
representative of weight loss in a large population of middle-aged men.
b.
The health department is charged with finding out if the rate of flu per thousand citizens
for this past flu season is comparable to the average rate of the past 50 seasons.
c.
Blair is almost sure that his monthly costs for the past year are not representative of his
average monthly costs over the past 20 years.
12. There were about 15 flu cases per week, this flu season, in the Oshkosh school system. The
weekly average for the entire state is 16 and the standard deviation, is 2.35. Are the kids in Oshkosh
as sick as the kids throughout the state?
From Salkind (2011). Copyright © 2012 SAGE. All Rights Reserved. Adapted with permission.
Part B
Complete the following questions. Be specific and provide examples when relevant.
Cite any sources consistent with APA guidelines.
Question
Answer
The average raw math achievement score for
third graders at a Smith elementary school is
137; third graders statewide score an average
of 124 with a standard deviation of 7. Are the
Smith third graders better at math than third
Copyright © 2013 by University of Phoenix. All rights reserved.
Time to Practice Week Three
PSYCH/625 Version 1
3
graders throughout the state? Perform the
correct statistical test, applying the eight steps
of the hypothesis testing process as
demonstrated on pp. 185187 of Statistics for
People Who (Think they) Hate Statistics.
What is a research question that you would like
to answer? Write the null and research
hypotheses. Would you use a one- or two-tailed
test? Why?
What do we mean when we say that a
statistical result is significant? What is the
difference between a statistically significant and
a meaningful result? Why is statistical
significance important?
Describe a Type I error for the previous study
that compares third graders math achievement.
Describe a Type II error for that study.
Copyright © 2013 by University of Phoenix. All rights reserved.
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