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Emily R.
Lab Manager at the University of Memphis Psychotherapy Research Lab
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Geometry
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Question:

Using the Pythagorean Theorem, find b when a = 5 and c = 13.

Emily R.

$​$ a^{2} + b^{2} = c^{2}  5^{2} + b^{2} = 13^{2}  25 + b^{2} = 169  b^{2} = 169 - 25  \sqrt{b^{2}} = \sqrt{144}  b = 12

Basic Math
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Question:

What happens when you multiply a negative number times another negative number?

Emily R.

You get a positive number!

Psychology
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Question:

Name two research designs frequently used in developmental psychology. Why are cohort effects significant challenges to these analyses?

Emily R.

Cohort effects are differences attributable to the generation or year in which you were born. Two major forms of design used in developmental research include cross-sectional designs and longitudinal designs. Cross-sectional designs involve recruiting groups of different ages and testing them at the same time. Longitudinal designs involve recruiting one group of participants and repeatedly testing them over time. Cohort effects raise problems for both types of design. While cross-sectional designs want to look at change in the dependent variable, they are only truly able to measure differences between the groups being measured, that is, cohort effects. In other words, cross-sectional designs have great external validity, but lack internal validity. Longitudinal designs typically suffer from attrition and lack of relevance by the end of their data collection. Most notably, however, longitudinal designs are lacking in external validity.

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