lecture2 - Psych 100A Fall 2010 Introduction to Statistics...

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Psych 100A Fall 2010 Introduction to tatistics Statistics Lecture 2 1
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Types of research designs • What type of research design is this study? hoices: Choices: –Naturalistic observation = observing behaviors without any intervention –Archival record = using existing information (already recorded observations) –Survey = collecting responses of a group of individuals xperiment = carefully controlled situation –Experiment = carefully controlled situation where the independent variable is manipulated and the effect on the dependent variable is monitored. 2
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uantitative Data Quantitative Data. The usual table of choice is the frequency ble table . Data presented in simplified form as grouped data. Number of groups or class intervals are decided by common sense and good judgment (e.g. 6-20 groups). Implied limits are the boundaries or endpoints of the class intervals and depend on the convention for rounding. 3
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requency table (continued) Frequency table (continued) . Number of observations in each class terval is the requency interval is the frequency . The relative frequency is the frequency divided by the total (usually multiplied by 100%). The cumulative relative frequency for a given interval is the sum of the relative requencies of the intervals that frequencies of the intervals that precede it plus the relative frequency of he given interval. the given interval. 4
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Example of frequency table 144 ages of donors in renal transplants Implied Limits Interval Class Freq. Relative% Cum% point Mid- 10 - 19 0 - 9 [ 9.5 - 19.5) 19.5 - 9.5) 14.5 4.5 12 7 8.3 2.6 8.3 0.9 20 29 30 - 39 40 - 49 0 9 [ 19.5 29.5) [ 29.5 - 39.5) [ 39.5 - 49.5) 495
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This note was uploaded on 03/15/2010 for the course PSYCHOLOGY 100B taught by Professor Firstenberg,i. during the Winter '10 term at UCLA.

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lecture2 - Psych 100A Fall 2010 Introduction to Statistics...

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