IMathAS-libretexts

Which of the following would have made the z-test appropriate in the preceding scenario?

If the sample size had been 15 instead of 5, but the standard deviation of 1.11 had still been computed for the sample (with the rest of the scenario unchanged).
If the sample size had still been 5, but the standard deviation of 1.11 had been for the population of all circuit boards produced by the process (with the rest of the scenario unchanged).