Assignment
Part 1
Identifying Statistical Tests in the Literature Worksheet
Research in the University Library to find three empirical (those containing data) research articles using one of the analytic methods studied this week (i.e., ztest, independent sample ttest, repeated measures ttest).
Select articles that are of interest to you andinclude the citations at the end of this document.
Fill out the following tables and answer each question in 1 to 2 sentences.
Title of Article:
Question
What is the null hypothesis (implied or explicitly stated)?
What is the research hypothesis (implied or explicitly stated)?
What was the type of analysis (ztest, independent sample ttest, repeated measures ttest) chosen, and why was it appropriate?
Part 2
Probability and Statistical Analysis Worksheet
Complete Parts A, B, and C below.
Part A
Why is a z score a standard score? Why can standard scores be used to comparescores from different distributions? Why is it useful to compare different distributions?
For the following set of scores, fill in the cells. The mean is 74.13 and the standarddeviation is 9.98.
|
Raw score
|
Z score
|
|
68.0
|
?
|
|
?
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-1.6
|
|
82.0
|
?
|
|
?
|
1.8
|
|
69.0
|
?
|
|
?
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-0.5
|
|
85.0
|
?
|
|
?
|
1.7
|
|
72.0
|
?
|
Questions 3a through 3d are based on a distribution of scores with X¯=75 and the standard deviation = 6.38. Draw a small picture to help you see what is required.
What is the probability of a score falling between a raw score of 70 and 80?
What is the probability of a score falling above a raw score of 80?
What is the probability of a score falling between a raw score of 81 and 83?
What is the probability of a score falling below a raw score of 63?
Jake needs to score in the top 10% in order to earn a physical fitness certificate. The class mean is 78 and the standard deviation is 5.5. What raw score does he need?
Part B
The questions in Part B require that you access data from the Pulse Rate Dataset.
The data is based on the following research problem:
Ann conducted a study on the things that may affect pulse rate after exercising. She wants to describe the demographic characteristics of a sample of 55 individuals who completed a large-scale survey. She has demographic data on the participants' gender (two categories), their age (open ended), their level of exercise (three categories), their height (open ended), and their weight (open ended).
Using Microsoft®Excel®software, run descriptive statistics on the gender and level of exercise variables. From the output, identify the following:
Percent of men
Mode for exercise frequency
Frequency of high level exercisers (exercise level 1) in the sample
Using Microsoft Excel software, run descriptive statistics to summarize the data on the age variable, noting the mean and standard deviation. Copy and paste the output from Microsoft Excel into this worksheet.
Part C
Answer the questions below in at least 90 words. Be specific and provide examples when relevant.
Citeany sources consistent with APA guidelines.
Question
How does understanding probability help you understand inferential statistics?
When have you used probability in everyday life? How did you use it?
Which do you think would be a more serious violation: a Type I or Type II error? And why?
What are the characteristics that separate parametric and nonparametric tests?
What does statistical significance mean? How do you know if something is statistically significant? What is the difference between statistical significance and practical significance?
Format your assignment according to the following formatting requirements:
1. The answer should be typed, double spaced, using Times New Roman font (size 12), with one-inch margins on all sides.
2. The response also include a cover page containing the title of the assignment, the student's name, the course title, and the date. The cover page is not included in the required page length.
3. Also Include a reference page. The Citations and references should follow APA format. The reference page is not included in the required page length.