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An advertising firm is comparing two different 30 second television ads for a new mobile phone A group of 48 volunteers is divided randomly into two groups of 24 and each group watches one of the ads Afterwards all the subjects are asked to estimate on a scale of 1 no way to 10 definitely whether they would consider buying this phone the next time they upgrade to a new phone Let and 2 represent the mean rating we would observe for the entire population represented by the volunteers if all members of this population saw the first or second ad respectively The data is given in the table below Dot plots for the two sets of ratings show no indication of non Normality Ad 1 Ad 2 n e 24 24 Which of the following is a correct interpretation of this interval X 6 1 4 8 S 1 7 1 3 Select one a We are 98 confident that this interval captures the true difference in mean rating for the first and second ad b 98 of the intervals construction this way will contain the value 0 C There is a 98 probability that we have not captured the true difference in the population means d There is a 0 98 probability that the true difference in mean rating for the first and second ad in this interval 98 of the time the true difference in mean rating between the first and second ad will be in this interval

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