The Journal of Applied Psychology reported on a study that examined whether the

Question

The Journal of Applied Psychology reported on a study that examined whether the content of TV shows influenced the ability of viewers to recall brand names of items featured in the commercials. The researchers randomly assigned volunteers to watch one of three programs, each containing the same nine commercials. One program had violent content, another sexual content, and the third had neutral content. After the shows ended, the subjects were asked to recall the brands of products that were advertised. The number of brands recalled was recorded for each subject. The standard deviations for the three groups were roughly the same. In this problem, we'll consider only the violent and neutral programming. A 95% confidence interval for the difference in mean number of brands recalled between the violent and neutral programs (violen neutral) was (-1.3, -0.5) a. Which of the following is the correct interpretation of this confidence interval? A. Those watching neutral programming recall between 0.5 and 1.3 more brands than those watching violent programming 95% of the time B. We're 95% confident that those watching neutral programming recall between 0.5 and 1.3 more brands than those watching violent programming on average ° C. We're 95% confident that those watching violent programming recall between 0.5 and 1.3 more brands than those watching neutral programming on average D. There's a 95% chance that those watching neutral programming will recall between 0.5 and 1.3 more brands than those watching violent programming E. 95% of those watching neutral programming recall between 0.5 and 1.3 more brands than those watching violent programming b. If there were 24 subjects watching violent programming and 29 watching neutral programming, what is the value of the degrees of freedom for the t critical value used in constructing the confidence interval? (Recall, this quiz covers Lessons 7 and 8 only. Do NOT use methods from Lesson 9) c. Calculate the margin of error for this problem. (Round to 2decimal place after the decimal point.) d. Based on the confidence interval, which is a correct conclusion? A. There is no evidence at the 5% significance level to indicate that the number of brands recalled for those watching violent programming is different than for those watching neutral programming, on average since 0 is in the confidence interval those watching neutral programming, on average since the difference in the sample means is in the confidence interval watching neutral programming, on average since 0 is not in the confidence interval. ( B. There is no evidence at the 5% significance level to indicate that the number of brands recalled for those watching violent programming is different than for ° C. There is evidence at the 5% significance level to indicate that the number of brands recalled for those watching violent programming is different than for those D. There is evidence at the 5% significance level to indicate that the number of brands recalled for those watching violent programming is different than for those watching neutral programming, on average since 0 is in the confidence interval There is no evidence at the 5% significance level to indicate that the number of brands recalled for those watching violent programming is different than for those watching neutral programming, on average since 0 is not in the confidence interval E.

Explanation / Answer

a. E is the correct answer

b. B

For, b, there is not corect answer. hence, I modified the answer as "since 0 is in the confidence interval" instead of "since 0 is not in the confidence interval"

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