Logan accessed an existing database to answer his research question regarding the role of identification of a learning disability and odds of going to a private school. The variables of interest include category of disability, type of school, achievement scores in the first, third, and sixth grade, parents SES.
-Logan will report a measure of variability for each of the achievement scores. Which will he most likely report?
A) Mean
B) Range
C) Standard Deviation
D) Median

Question

Quizplus · Accepted Answer

Standard deviation is a measure of variability that describes how much the scores in a distribution differ from the mean. It is commonly used to report the dispersion of scores around the central tendency (i.e., mean). Thus, Logan will most likely report standard deviation for each of the achievement scores. This will give a sense of how much the students' performance varied from the mean in each grade level.

Logan Accessed an Existing Database to Answer His Research Question