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...

Extracted text: 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: Estimated Speed Smashed into Hit n = 15 n = 15 M=40.8 M - 34.9 SS 510 SS 414 3= 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 to measure effect size


Extracted text: Modify the subquestion (a) as follows: (a) Conduct a two-tail test with alpha = .05 to examine whether the data indicate a significantly higher estimated speed for the "smashed into" group. Make sure to show your work for the following intermediate steps: • State your hypotheses • Sketch the sampling distribution. Shade the part that you are interested in. • Identify your critical values using the t table • Compute the pooled variance and estimate of standard error. Show your work. • Compute the t score for your sample mean difference. • Decide whether you reject or fail to reject the null hypothesis. As your final conclusion, state whether question wording impacts perceptions of car speed.