PSY625 R1 Wk3: Time To Practice
PSY625 R1 Wk3: Time To Practice
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.
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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 onesample 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 chocolateonly diet is representative of weight loss in a large population of middleaged 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 graders throughout the state? Perform the correct statistical test, applying the eight steps of the hypothesis testing process as demonstrated on pp. 185–187 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 twotailed 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.

psych625_r1_week_three_time_to_practice_1.docm
Title ABC/123 Version X
1 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 outofseat classroom behavior? NullThere are no effects of attention on out of seat classroom behavior. Nondirectional Attention affects outofseat classroom behavior. Directional No attention negatively instigates outofseat 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. PSY625 R1 Wk3: Time To Practice
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 studentathletes. Hypothesis There is a difference between the amount of money spent on food among undergraduate students and undergraduate studentathletes. 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 onetailed test and a research hypothesis tested using a twotailed test.
One tailed:
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 onesample 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 chocolateonly diet is representative of weight loss in a large population of middleaged 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 graders throughout the state? Perform the correct statistical test, applying the eight steps of the hypothesis testing process as demonstrated on pp. 185–187 of Statistics for People Who (Think they) Hate Statistics. PSY625 R1 Wk3: Time To Practice What is a research question that you would like to answer? Write the null and research hypotheses. Would you use a one or twotailed 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 © XXXX by University of Phoenix. All rights reserved.
Copyright © 2013 by University of Phoenix. All rights reserved.
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