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Chapter 5

PSYB01 Chapter 5 textbook notes

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Anna Nagy

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Chapter 5 Measurement Concepts The most common measurement strategy is to ask people to tell you about themselves Ie. Rate your overall happiness You can also directly observe behaviours Ie. How many mistakes did someone make on a task Psychological and neurological responses can be measured as well. Ie. heart rate, muscle tension In this chapter we need to consider the technical aspects of measurement: reliability, validity, and reactivity of measures Reliability of measures Reliability refers to the consistency or stability of a measure of behaviour A reliable test would yield the same results each time when given to the same person A reliable measurement doesnt fluctuate from one reading to the next If there is fluctuations in readings then there is an error in the measurement device Every measurement has two components: 1. Atrue scor: the real score on the variable 2. Ameasurement error An unreliable measure contains considerable measurement error; an unreliable measure contains little measurement error (itll yield an identical, or nearly identical, score each time the same person is measured) Example: If you administer a highly reliable test multiple times, the scores on them might be in the range of 97-103 with the average at 100; you also used an unreliable test where there scores range from 85-115 with the average at 100. The measurement error in the unreliable test is revealed in the greater variability shown in the scores (seere , pg 92) When doing actual research, you cant administer a test several times and then take the average; therefore, its essential that the test be reliable so that it could closely reflect the persons true score Trying to study behavior using unreliable measures is a waste of time because the results will be unstable and are unable to be replicated Reliability is most likely to be achieved if researchers use careful measurement procedures We can assess the stability of measures using correlation coefficients The most common correlation coefficient when discussing reliability is the moment correlation coefficient Symbolized as r Ranges from 0.00 to +1.00 and 0.00 to -1.00 0.00 means that the variables are not related at all A + means that there is a positive relationship, whereas a means that there is a negative relationship The higher the value, the stronger the relationship (ie. +0.8 is stronger than 0.8) 1 www.notesolution.com
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