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 into" group reported significantly higher 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:

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Fail to reject H₀. These data indicate a significant difference in estimated speed between the two groups.
 
Reject H₀. These data indicate a significant difference in estimated speed between the two groups.
 
Reject H₀. These data do not indicate a significant difference in estimated speed between the two groups.
 
Fail to reject H₀. These data do not indicate a significant difference in estimated speed between the two groups.
 
 
Compute r² to measure effect size.
5. Gravetter/Wallnau/Forzano, Essentials - Chapter 10 - End-of-chapter question 24
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 into" group reported significantly higher 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:
Estimated Speed
"Smashed Into"
"Hit"
in
15
15
M
40.8
34.9
510
414
Do the results indicate significant difference in estimated speed between the two groups? Use a two-tailed test with a = .05.
Pooled Variance
Estimated Standard Error
t Statistic
Critical Values
33.0
2.81
2.457
Transcribed Image Text:5. Gravetter/Wallnau/Forzano, Essentials - Chapter 10 - End-of-chapter question 24 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 into" group reported significantly higher 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: Estimated Speed "Smashed Into" "Hit" in 15 15 M 40.8 34.9 510 414 Do the results indicate significant difference in estimated speed between the two groups? Use a two-tailed test with a = .05. Pooled Variance Estimated Standard Error t Statistic Critical Values 33.0 2.81 2.457
Compute r2 to measure effect size.
r2 =
Now, increase the variability by doubling the two SS values to SS, = 1,020 and SS, = 828. Repeat the hypothesis test and the measure of effect size.
t Statistic
Pooled Variance Estimated Standard Error
Critical Values
Reject H,. These data indicate a significant difference in estimated speed between the two groups.
Fail to reject H.. These data indicate a significant difference in estimated speed between the two groups.
Reject H.. These data do not indicate a significant difference in estimated speed between the two groups.
Fail to reject H.. These data do not indicate a significant difference in estimated speed between the two groups.
r2 =
Comparing your answers for the preceding parts, describe how sample variability influences the outcome of the hypothesis test and the measure of
effect size.
Increasing the sample variability
the likelihood of rejecting the null hypothesis and
the size of r2.
Transcribed Image Text:Compute r2 to measure effect size. r2 = Now, increase the variability by doubling the two SS values to SS, = 1,020 and SS, = 828. Repeat the hypothesis test and the measure of effect size. t Statistic Pooled Variance Estimated Standard Error Critical Values Reject H,. These data indicate a significant difference in estimated speed between the two groups. Fail to reject H.. These data indicate a significant difference in estimated speed between the two groups. Reject H.. These data do not indicate a significant difference in estimated speed between the two groups. Fail to reject H.. These data do not indicate a significant difference in estimated speed between the two groups. r2 = Comparing your answers for the preceding parts, describe how sample variability influences the outcome of the hypothesis test and the measure of effect size. Increasing the sample variability the likelihood of rejecting the null hypothesis and the size of r2.
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