n 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. EstimatedSpeed Hit Smashed into n1 = 15 n2 = 15 x̅1 = 40.8 x̅2 = 34.0 SS1 = 510 SS2= 414 Do the results indicate a significantly higher estimated speed for the "smashed into" group? Use a one-tailed test with α = .01. a. Which of the following correctly represents the null and alternative hypothesis b. what represents the proper critical region c. Compute the test statistic d. Based on the calculated test statistic, would you reject the null hypothesis established in question a e. Based on the previously conducted steps, we can conclude f. Calculate Cohen's d to measure the size of the effect
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.
EstimatedSpeed Hit
Smashed into n1 = 15
n2 = 15
x̅1 = 40.8 x̅2 = 34.0
SS1 = 510 SS2= 414
Do the results indicate a significantly higher estimated speed for the "smashed into" group? Use a one-tailed test with α = .01.
a. Which of the following correctly represents the null and alternative hypothesis
b. what represents the proper critical region
c. Compute the test statistic
d. Based on the calculated test statistic, would you reject the null hypothesis established in question a
e. Based on the previously conducted steps, we can conclude
f. Calculate Cohen's d to measure the size of the effect
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