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MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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In 1974, Loftus and Palmer conducted a classic study demonstrating how the language used to ask a question can influence eyewitness memory. In the study, college students watched a film of an automobile accident and then were asked questions about what they saw. One group was asked, “About how fast were the cars going when they smashed into each other?” Another group was asked the same question except the verb was changed to hit instead of smashed into. The smashed “group reported significantly higher estimates of speed than the hit group. Suppose a researcher repeats this study with a sample of today college students and obtains the following results.
Estimated Speed
Smashed into Hit
n = 15 n = 15
M = 40.8 M = 34.0
SS = 510 SS = 414

a.) Use an independant-Measures t test with α=0.05 to determine whether there is a significant difference between the two conditions and compute r^2 to measure effect size

b.) Now, increase the variability by doubling the two SS values to SS1=1,020 and SS2=828. Repeat the hypothesis test and the measure of effect size

c.) Comparing your answers for parts a & b, describe how sample variability influences the outcome of the hypothesis test and the measure of the effect size.

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