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In this document topics covered which are Experimental Design, Examples, Independent Variable, Dependent Variable,Control Variable.
Typology: Lecture notes
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Experimental Design An experiment deliberately imposes a treatment on a group of objects or subjects in the interest of observing the response. OBSERVATION / TEST UNITS Each person / thing whose response / data / information on independent variable that we take
Examples H 0 : Students who receive pizza coupons as a reward do not read more books than students who do not receive pizza coupon as rewards. Independent Variable: Reward Status Dependent Variable: Number of Books Read Control Variable: Interest in books H 0 : High achieving students do not perform better than low achieving student when writing stories regardless of whether they use paper and pencil or a word processor. Independent Variable: Instrument Used for Writing Control Variable: Ability Level of the Students Dependent Variable: Quality of Stories Written
(^) there are two conditions in this design (^) one time point (^) a treatment X was administered to first group (the experimental group) (^) no treatment was administered to the other group (the control group). (^) measurement O occurred post-treatment for the experimental group. (^) participants were not randomly assigned to the two conditions.
(^) there are two time periods in this design (^) a treatment X was administered to one group (the experimental group) measurement O at two time points^ O 1 and O 2 (^) participants were not randomly assigned to condition. (^) there is one time point in this design (^) a treatment X was administered to 3 groups simultaneously (the experimental groups) X 1
2
3 measurements are^ O 1 , O 2 and O 3 (^) participants were randomly assigned to 1st two conditions. (^) participants were not randomly assigned to 3 rd condition.
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1 R X 2
2 X 3
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