Whom do you trust? Companies often place advertisements to improve theimage of their

Chapter 0, Problem 19.6

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Whom do you trust? Companies often place advertisements to improve theimage of their brand rather than to promote specific products. In a randomizedcomparative experiment, business students read ads that cited either the WallStreet Journal or the National Enquirer for important facts about a fictitiouscompany. The students then rated the trustworthiness of the source on a 7-pointscale. The mean trustworthiness scores were 4.77 for the Journal and 2.43 for theEnquirer. The two-sample t statistic was t = 8.37.4(a) You can draw a conclusion from this t without using a table and even withoutknowing the sizes of the samples (as long as the samples are not tiny). What isyour conclusion? Why dont you need the sample sizes and a table?(b) In fact, 66 students read the ad citing the Journal and 61 read the ad citingthe Enquirer. What degrees of freedom would you use for the t test if you followthe conservative approach recommended for use without software?

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