A researcher wants to carry out a hypothesis test involving the mean for a sample of size n = 15.He does not know the true value of the population standard deviation,but is reasonably sure that the underlying population is approximately normally distributed.Should he use a z-test or a t-test in carrying out the analysis? Why?

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The Answer of A researcher wants to carry out a hypothesis test involving the mean for a sample of size n = 15.He does not know the true value of the population standard deviation,but is reasonably sure that the underlying population is approximately normally distributed.Should he use a z-test or a t-test in carrying out the analysis? Why?

A Researcher Wants to Carry Out a Hypothesis Test Involving