Loftus and Palmer study (1974) demonstrated the influence of language on eyewitness memory. Participants watched a film of a car accident and were asked questions about what they saw. One group was asked “About how fast the cars were 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 ‘smasher into” group reported significantly higher estimates of speed than the hit group. Suppose a researcher repeats this study with two samples of college students and obtains the following results: Estimated Speed Smashed into hit n = 16 n = 16 M = 40 M = 34 SS = 510 SS = 414 Is there a significantly higher estimated speed for the “smashed into” group? Use a one-tailed test with α = .01. a. Your alternativel hypothesis in words is: b. Your null hypothesis in symbols is: Note: µ1 = "smashed into" group; µ2 = "hit" group c. The critical t value is d. The t-statistic is e. Your decision is f. The estimated Cohen's d is: g. Use the data to make a 99% confidence interval estimate of the mean difference in estimate speed between the “smashed into” group and the “hit” group The lower limit of the confidence interval is: h. Use the data to make a 99% confidence interval estimate of the mean difference in estimate speed between the “smashed into” group and the “hit” group The upper limit of the confidence interval is:
Loftus and Palmer study (1974) demonstrated the influence of language on eyewitness memory. Participants watched a film of a car accident and were asked questions about what they saw. One group was asked “About how fast the cars were 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 ‘smasher into” group reported significantly higher estimates of speed than the hit group. Suppose a researcher repeats this study with two samples of college students and obtains the following results:
|
Estimated Speed |
|
|
Smashed into |
hit |
|
n = 16 |
n = 16 |
|
M = 40 |
M = 34 |
|
SS = 510 |
SS = 414 |
Is there a significantly higher estimated speed for the “smashed into” group? Use a one-tailed test with α = .01.
a. Your alternativel hypothesis in words is:
The lower limit of the confidence interval is:
h. Use the data to make a 99% confidence interval estimate of the mean difference in estimate speed between the “smashed into” group and the “hit” group
The upper limit of the confidence interval is:
i. Report the results of the hypothesis test in APA. As a measure of the effect size use the confidence interval.
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