while reading a magazine, sarah came across the headline below. curious, she wonders if it's true and decides to practice her statistical skills by running a statistical analysis to test her hypothesis. she knows previous research has shown that an average of 10,354 harry potter books are sold in each of the 627 us barnes and noble book stores each year. to see if these sales have decreased, she randomly selects 30 us barnes and noble book stores and calculates an average of 8,103 books sold at each store, with a standard deviation of 2110.4. sarah calculates a test statistic of 5.84 with a p-value of .04. what is the correct statistical test in this situation and what would be sarah's statistical conclusion (assuming an alpha of .05)? while reading a magazine, sarah came across the headline below. curious, she wonders if it's true and decides to practice her statistical skills by running a statistical analysis to test her hypothesis. she knows previous research has shown that an average of 10,354 harry potter books are sold in each of the 627 us barnes and noble book stores each year. to see if these sales have decreased, she randomly selects 30 us barnes and noble book stores and calculates an average of 8,103 books sold at each store, with a standard deviation of 2110.4. sarah calculates a test statistic of 5.84 with a p-value of .04. what is the correct statistical test in this situation and what would be sarah's statistical conclusion (assuming an alpha of .05)? the correct test statistic is a one-sample t-test, and sarah should conclude that the average number of harry potter books sold in each barnes and noble bookstore has decreased significantly from the given average of 10,354. the correct test statistic is a z of x-bar, and sarah should conclude that the average number of harry potter books sold in each barnes and noble bookstore has decreased significantly from the given average of 10,354. the correct test statistic is a one-sample t-test, and sarah should conclude that the average number of harry potter books sold in each barnes and noble bookstore has not decreased significantly from the given average of 10,354. the correct test statistic is a z of x-bar, and sarah should conclude that the average number of harry potter books sold in each barnes and noble bookstore has not decreased significantly from the given average of 10,354.
