PSYCH 625 Week 3 Time to Practice
Complete both Part A and Part B below.
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?
b. What is the relationship between the quality of a marriage and the quality of the spouses’ relationships with their siblings?
c. What is the best way to treat ...view middle of the document...
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?
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? | ...