Q57. A bookstore in your city claims tht fiction books have more sales in the second half of the year than in the first half. Average monthly sales for a sample of fiction books sold at bookstores throughout the city over a period of oneyear provides the following data for gross earnings (in dollars) during the two halves of the year. Year: first half n = 194; mean = 17947; sd = 2047; min = 10931; max = 23454 year: second half n = 305; mean = 38832; sd = 1259; min = 22343; max = 53347 Q58. Book sales, part 2. Here is some additional information about the fiction books' sales data presented in exercise 57. It is generally thought that sales spike during the year-end holidays. So the sales during year-end holidays were omitted, and the new summary statitics was determined as given below. Year: first half n = 194; mean = 17947; sd = 2047; min = 10931; max = 23454 year: second half n = 248; mean = 21861; sd = 1083; min = 19972; max = 25396 Do sales appear to be higher during the second half of the year after omitting those data most influenced by year-end holidays? a) write the null and alternative hypothesis. b) test the null hypotehsis, and state your conclusion. c) Suggest additional factors that may influence fiction book's sales not accounted for in this exercise.

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