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Amazon introduced a lightweight e-book reader-the Kindle-in 2007.
Z-test
A method of statistical analysis that evaluates whether there is a significant difference between the means of two populations, given known variances and a large sample size.
µ = 109
Represents the mean (µ) of a dataset or distribution, here specifically stated as 109.
Z-statistic
A specific kind of norm score that shows the number of standard deviations by which an individual item deviates from the distribution's average.
Critical Value
The threshold in a statistical test that defines the boundary for rejecting the null hypothesis.
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