# Question

In 2007, Apple stock had a mean daily volume of 35.1 million shares, according to Yahoo!Finance. A random sample of 40 trading days in 2010 resulted in a sample mean of 23.6 million shares with a standard deviation of 11.7 million shares.

(a) Based on the histogram and boxplot shown (from StatCrunch), why is a large sample necessary to conduct a hypothesis test about the mean?

(b) Does the evidence suggest that the volume of Apple stock has changed since 2007? Use the α = 0.05 level of signiﬁcance.

(a) Based on the histogram and boxplot shown (from StatCrunch), why is a large sample necessary to conduct a hypothesis test about the mean?

(b) Does the evidence suggest that the volume of Apple stock has changed since 2007? Use the α = 0.05 level of signiﬁcance.

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