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chapter 3 notes

by: Allie Sunshine

chapter 3 notes esc_ps

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Allie Sunshine
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About this Document

these notes cover what will be on the upcoming exam.
introduction to statistics
Dr. Easter
Class Notes
Statistics, applies, intro
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This 3 page Class Notes was uploaded by Allie Sunshine on Monday February 1, 2016. The Class Notes belongs to esc_ps at a university taught by Dr. Easter in Winter 2016. Since its upload, it has received 23 views.


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Date Created: 02/01/16
Chapter three 01/28/2016 ▯ Convenient sample- observing only your class because it is convenient. ▯ ▯ Purposeful sample- sometimes it is important to have a purposeful sample and make sure that all of the people there are necessary to be being observed even if they aren’t convenient to obtain. ▯ Ex: if you are doing an experiment on people who won the lottery you will need to go out and find people who won the lottery. ▯ ▯ Likert scale- presents statements (often attitudinal in nature) and asks if the subjects agree or disagree with the statements. ▯ Example- I feel as though this class is easy to listen to and am engaging. ▯ ▯ Strongly agree agreed disagree ▯ 1 2 3 4 5 6 7 8 9 10 ▯ ▯ ***Psychometric properties – reliability and validity of measurement. ▯ ▯ Reliability- refers to the consistency of measurement. “If I give you a test and then I give you the test again are the answers going to be similar, are the scores going to be similar?”  Observed score- score that a person obtains on a test. There is some assumed error calculated into this score  True score- a theoretical concept that refers to the score that a person would have gotten on a test with out any measurement error. o Test and retest- administrate the same test at time 1 and time 2 and correlate the 2 sets of scores to obtain a test/retest reliability coefficient. o Parallel forms- two forms of a test that is different yet equivalent. Administer these tests to the same group and correlate the two sets of scores to obtain a reliability coefficient. o Internal consistency- administers one test; enter certain info into formulas to obtain a reliability coef.  RELIABILITY COEFFICENT- symbolized by “r” ▯ Evaluating the reliability of measurement- ▯ Achievement- r is greater than or equal to .80 ▯ Aptitude- r is greater than or equal to .80 Attitudinal- r is greater than or equal to .70 Personality- r is greater than or equal to .60 ** If anything is .60 or below it is considered NOT reliable. ▯ ▯ ▯ Validity- refers to the accuracy of inferences made from test scores in the context in which they are interpreted. That is, how “accurate is the measure” ▯ **If you don’t have reliability then you do NOT have validity, consistency or accuracy. - Face validity- a test can be said to have face validity if it “looks like” it measures what it claims to measure. Correlation- Differentiate- Change- Criterion related validity- determined by comparing scores on a predictor with scores on a criterion. Concurrent validity- Holistic view on validity- should be viewed as a single concept. With various evidences used to support or refute the proposed interpretations and uses. [Content, response process, internal structure, relation to variables consequences of use]


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