Practice Worksheet-Identifying Confounding Variables Name: 1. Rescarchers condua

Question

Practice Worksheet-Identifying Confounding Variables Name: 1. Rescarchers conduactod an esperiment to test whether the smell of freshly baked bread afects how good hread is perceived to taste Ferty subjects were randomly assigned into one of two groups In the first group. the subjects tanted the bread while the odor of freshly haked bread was puped into the room through a vent In the sundmoup, the subiects takil the type of bread as- the first grosp without an odor being piped into the room through a venk. After tasting the bread, each subject was asked to rae how good the bread tasted on a sale of 1-1011-does mualc pot I0 atastes ,ery good. The researches fund th·h"orage- rating of group was 89 anl the average taste rating of gro2 was 71 ca significant difference). Independent Variable of Interest? Dependent Variable? Conclusion the researcher would lake to make based on the findings? Confounding Variable? Alternative Conclusion of the Results Based on the Presence of the Confounding Variable? Re-Design the Experiment to Remove the Confounding Variable

Explanation / Answer

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a) A variable is any item or quantity that can vary or take on different values. The variables of interest in a statistical study are the items or quantities that the study seeks to measure. The explanatory variable may explain or cause the effect.

Here, VOI = muscular tension

b) Dependent = success in learning

c) On the besis of findings, he would say that there is a relationship between both.

rather a positive relationship as learning increased as muscle was tensed.

d) A confounding variable is an outside influence that changes the effect of a dependent and independentvariable. This extraneous influence is used to influence the outcome of an experimental design.

So, here there may be many variables of these type. For example, tensed muscle group might have been given easier words to memorize. Time given to recall might be another factor.

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