Based on previous research and sound theoretical considerations, an experimental psychologist believes that memory for pictures is different than memory for words. To test this hypothesis the psychologist performs an experiment in which students from an introductory psychology class are used as subjects. Eight randomly selected students view slides with nouns printed on them and another group of eight randomly selected students view slides with pictures of the same nouns. Each slide contains either one picture or one noun and is viewed for four seconds. After viewing all the slides, subjects are given a memory recall test and the number of correctly remembered items is measured. The data are listed below.Number of Pictures Recalled: 18, 21, 14, 25, 23, 19, 26, 15Number of Nouns Recalled: 12, 9, 21, 17, 16, 10, 19, 12Is the mean recall of words significantly different than that of pictures? Test with an α = 0.01.Calculate and interpret the effect size.How would the results of your hypothesis test change if you used an α = 0.05?Which group remembered more items on average? What was that group's mean?

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Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.6: Summarizing Categorical Data

Problem 13CYU

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Based on previous research and sound theoretical considerations, an experimental psychologist believes that memory for pictures is different than memory for words. To test this hypothesis the psychologist performs an experiment in which students from an introductory psychology class are used as subjects. Eight randomly selected students view slides with nouns printed on them and another group of eight randomly selected students view slides with pictures of the same nouns. Each slide contains either one picture or one noun and is viewed for four seconds. After viewing all the slides, subjects are given a memory recall test and the number of correctly remembered items is measured. The data are listed below.

Number of Pictures Recalled: 18, 21, 14, 25, 23, 19, 26, 15

Number of Nouns Recalled: 12, 9, 21, 17, 16, 10, 19, 12

Is the mean recall of words significantly different than that of pictures? Test with an α = 0.01.
Calculate and interpret the effect size.
How would the results of your hypothesis test change if you used an α = 0.05?
Which group remembered more items on average? What was that group's mean?

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