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PSYCH 625 Week 4 Individual Assignment Time To Practice Parts (A,B,C)
University of Phoenix Material
Time to Practice – Week Four
Complete Parts A, B, and C 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 Text Resources link.
1. Using the data in the file named Ch. 11 Data Set 2, test the research hypothesis at the .05 level
of significance that boys raise their hands in class more often than girls. Do this practice problem by
hand using a calculator. What is your conclusion regarding the research hypothesis? Remember to
first decide whether this is a one- or two-tailed test.
2. Using the same data set (Ch. 11 Data Set 2), test the research hypothesis at the .01 level of
significance that there is a difference between boys and girls in the number of times they raise their
hands in class. Do this practice problem by hand using a calculator. What is your conclusion
regarding the research hypothesis? You used the same data for this problem as for Question 1, but
you have a differenthypothesis (one is directional and the other is nondirectional). How do the
resultsdiffer and why?
3. Practice the following problems byhand just to see if you can get the numbersright. Using the
following information, calculate the ttest statistic.
4. Using the results you got from Question 3 and a level of significance at .05,what are the two-
tailed critical values associated with each? Would the nullhypothesis be rejected?
5. Using the data in the file named Ch. 11 Data Set 3, test the null hypothesis that urban and rural
residents both have the same attitude toward gun control. UseIBM®SPSS®software to complete the
analysis for this problem.
6. A public health researcher tested the hypothesis that providing new car buyers with child safety
seats will also act as an incentive for parents to take other measures to protect their children (such
as driving more safely, child-proofing the home, and so on). Dr. L counted all the occurrences of safe
behaviors in the cars and homes of the parents who accepted the seats versus those who did not.
The findings:a significant difference at the.013 level. Another researcher did exactly the same study;
everything was the same—same type of sample, same outcomemeasures, same car seats, and so on. Dr. R’s results were marginally significant(recallCh. 9) at the .051 level. Whichresult do you
trustmore and why?
7. In the following examples, indicate whether you would perform a t test ofindependent means or
a. Two groups were exposed to different treatment levels for ankle sprains.Which treatment was
b. A researcher in nursing wanted to know if the recovery of patients was quickerwhen some
received additional in-home care whereas when others received thestandard amount.
c. A group of adolescent boys was offered interpersonal skills counseling andthen tested in
September and May to see if there was any impact on familyharmony.
d. One group of adult men was given instructions in reducing their high bloodpressure whereas
another was not given any instructions.
e. One group of men was provided access to an exercise program and tested twotimes over a 6-
month period for heart health.
8. For Ch. 12 Data Set 3, compute the t value and write a conclusion on whether there is a
difference in satisfaction level in a group of families’ use of service centers following a social service
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