Question
A toy manufacturer wants to see how long, on average, a new toy captures children's attention. He tests 20children selected at random andfinds that their
A toy manufacturer wants to see how long, on average, a new toy captures children's attention. He tests 20children selected at random andfinds that their mean attention span is 20 minutes with a standard deviation of 6minutes. If we assume that attention spans arenormally distributed, find a 90%confidence interval for the mean attention span of children playing with this new toy. what are the lower and upper limits to the 90% confidence interval?
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Introduction to Probability
Authors: Mark Daniel Ward, Ellen Gundlach
1st edition
716771098, 978-1319060893, 1319060897, 978-0716771098
