Circle the best answer. The choice between a z-test and a t-test for a population mean depends primarily on: a. the sample size. b. the level of significance. c. whether a one - or two-tailed test is indicated. d. whether the given standard deviation is from the population or the sample. e. a z-test should never be used. 3

Question

Desiree Kidd

Mathematics

25 March, 09:40

Circle the best answer. The choice between a z-test and a t-test for a population mean depends primarily on: a. the sample size. b. the level of significance. c. whether a one - or two-tailed test is indicated. d. whether the given standard deviation is from the population or the sample. e. a z-test should never be used. 3

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Barber · Answer 1

a) The sample size

Step-by-step explanation:

t - student distribution should be used whe we are facing a Normal Distribution population andwhen a sample size n is below 30.

t - student distribution is also a associated to a bell shape but is more flat and the values are more spread, tails are much more wide.

t - student use the concept of degree of fredom (each degree of fredom correspont to an specific curve). As degree of fredom increase the curves become more close to a bell shape. For n = 30 t-student curve is a bell shape one