Question: Telemarketers generally read from a prepared script when they make their sales calls. A firm decides to change this prepared script, making it both friendlier

Telemarketers generally read from a prepared script when they make their sales calls. A firm decides to change this prepared script, making it both friendlier and shorter. Daily sales are recorded for a random sample of telemarketers, before and after the script change. The average difference-using a [(before the change) - (after the change)] order of subtraction-is + 4.2, with a sample size of 56. The differences have a standard deviation of 23.4. Do the data suggest that there is a difference in daily sales before and after the script change? Use α = 0.05. What assumption do you have to make in order to answer this question?

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We are not given the data set but some summary data We cannot check for normality of differences We proceed by assuming the differences are normally distributed and noting that our conclusions may not be valid if this is not the case H 0 D 0 H 1 D 0 The order of subtraction is before after The alternative hypothesis concerns a difference ... View full answer

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