PairedZTest
PairedZTest[data] tests whether the mean of the data is zero.
PairedZTest[{data1,data2}] tests whether the means of data1 and data2 are equal.
PairedZTest[dspec,σ] tests for zero or equal means assuming a population variance σ.
PairedZTest[dspec,σ,μ0] tests the mean against μ0.
PairedZTest[dspec,σ,μ0,"property"] returns the value of "property".
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