The Venkanarasimarajuvaripeta Publishing Company collects information on the retail prices of books and is a respected and reliable publisher of its findings.  Up until 2015, the mean retail price for all books was $ 43.50 with a standard deviation of $ 7.61.  In 2018,  retail prices for 40 randomly selected poetry books was $ 46.93. At the 1`% significance level, do the data provide sufficient evidence to conclude that this year’s mean price of all poetry books has increased since 2015?

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