Essay on Time to Pratice
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 |1.8 |
|69.0 …show more content…
a. Skewness b. Mean c. Standard deviation d. Kurtosis
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. |demand characteristics. The researcher is human and this means the