hypothesis test and the measure of effect size. 24. In 1974, Loftus and Palmer conducted a classic study demonstrating how the language used to ask a ques- tion 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 into" group reported significantly high- er estimates of speed than the "hit" group. Suppose a researcher repeats this study with a sample of today's college students and obtains the following results: 66 Estimated Speed Smashed into Hit n = 15 n = 15 M = 40.8 M = 34.9 %3D SS = 510 SS = 414 %3D %3D a. Use an independent-measures t test with a = .05 to determine whether there is a significant differ- ence between the two conditions and compute r to %3D measure effect size. b. Now, increase the variability by doubling the two SS values to SS, = the hypothesis test and the measure of effect size. c. Comparing your answers for Parts a and b, describe how sample variability influences the outcome of the hypothesis test and the measure of effect size. 1,020 and SS2 = 828. Repeat
hypothesis test and the measure of effect size. 24. In 1974, Loftus and Palmer conducted a classic study demonstrating how the language used to ask a ques- tion 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 into" group reported significantly high- er estimates of speed than the "hit" group. Suppose a researcher repeats this study with a sample of today's college students and obtains the following results: 66 Estimated Speed Smashed into Hit n = 15 n = 15 M = 40.8 M = 34.9 %3D SS = 510 SS = 414 %3D %3D a. Use an independent-measures t test with a = .05 to determine whether there is a significant differ- ence between the two conditions and compute r to %3D measure effect size. b. Now, increase the variability by doubling the two SS values to SS, = the hypothesis test and the measure of effect size. c. Comparing your answers for Parts a and b, describe how sample variability influences the outcome of the hypothesis test and the measure of effect size. 1,020 and SS2 = 828. Repeat
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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Transcribed Image Text:hypothesis test and the measure of effect size.
24. In 1974, Loftus and Palmer conducted a classic study
demonstrating how the language used to ask a ques-
tion 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 into" group reported significantly high-
er estimates of speed than the "hit" group. Suppose a
researcher repeats this study with a sample of today's
college students and obtains the following results:
66
Estimated Speed
Smashed into
Hit
n = 15
n = 15
M = 40.8
M = 34.9
%3D
SS = 510
SS = 414
%3D
%3D
a. Use an independent-measures t test with a = .05
to determine whether there is a significant differ-
ence between the two conditions and compute r to
%3D
measure effect size.
b. Now, increase the variability by doubling the two
SS values to SS, =
the hypothesis test and the measure of effect size.
c. Comparing your answers for Parts a and b, describe
how sample variability influences the outcome of
the hypothesis test and the measure of effect size.
1,020 and SS2 = 828. Repeat
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