Should she use z test or a t test in carrying out analysis

Reference no: EM131407158

A researcher wants to carry out a hypothesis test involving the mean for a sample of size .

She does not know the true value of the population standard deviation, but is reasonably sure that the underlying population is approximately normally distributed. Should she use a z-test or a t-test in carrying out the analysis? Why?

Reference no: EM131407158

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