University of Phoenix Material
Time to Practice – Week Two
Complete Parts A, B, and C below.
1. Why is a z score a standard score? Why can standard scores be used to compare scores from different distributions? It is a scores relationship to the mean indicating whether it is above or below the mean. It does this by converting scores to z score. Yes – keep going – just a bit more is needed.2 out of 3 pts
2. For the following set of scores, fill in the cells. The mean is 74.13 and the standard deviation is 9.98.
|Raw score |Z score |
|68.0 |-.6142 |
|?58.16 yes! |–1.6 |
|82.0 |.789 |
|92.09 ...view middle of the document...
This data is available on the student website under the Student Text Resources link.
The data sets for problems 5 and 6 can be found through the Pearson Materials in the Student Textbook Resource Access link, listed under Academic Resources. The data is listed in the data file named Lesson 20 Exercise File 1. Answer Exercises 5 and 6 based on the following research problem:
Ann wants to describe the demographic characteristics of a sample of 25 individuals who completed a large-scale survey. She has demographic data on the participants’ gender (two categories), educational level (four categories), marital status (three categories), and community population size (eight categories).
5. Using IBM® SPSS® software, conduct a frequency analysis on the gender and marital status variables. From the output, identify the following:
a. Percent of men
b. Mode for marital status
c. Frequency of divorced people in the sample
Please enter the numbers here so that I know that you know how to read the SPSS output. Please paste your SPSS output right here where it belongs.
2 out of 3 pts
6. Using IBM® SPSS® software, create a frequency table to summarize the data on the educational level variable. Copy and paste the output from IBM® SPSS® into this worksheet.
I can’t find the correct SPSS output. 0 out of 3 pts
7. The data set for this problem can be found through the Pearson Materials in the Student Textbook Resource Access link, listed under Academic Resources. The data is listed in the data file named Lesson 21 Exercise File 1. David collects anxiety scores from 15 college students who visit the university health center during finals week. Compute descriptive statistics on the anxiety scores. From the output, identify the following:
c. Standard deviation
I found the SPSS output. Now I need to you to type in the correct answers. 2 out of 3 pts.
From Green & Salkind (2011). Copyright © 2012 Pearson Education. All Rights Reserved. Adapted with permission.
Complete the questions below. Be specific and provide examples when relevant.
Cite any sources consistent with APA guidelines.
|Question |Answer |
|8. What is the relationship between reliability and validity? How |If data are valid they must be reliable if information is reliable that |
|can a test be reliable but not valid? Can a test be valid but not |does not mean that it is valid. Reliability is a necessary but not |
|reliable? Why or why not? Good start but the question isn’t |sufficient condition for validity. Having methods in place to ensure |
|completely answered. |validity there is trouble. It is two main reasons experimenter bias and |
|2 out of 3 pts. ...