1 Sample Z: Use this when you're testing a claim about a single population mean μ and you know the population standard deviation σ.Once you have the proper test chosen, the process is very similar for each of the tests. You will need to go to Stats / Basic Statistics and choose the proper kind of test. Test Statistics, P-Values, and Confidence Intervals Once you find this critical value, the right critical value is its opposite. If it is a two tail test, then the area to the left of the left critical value is α / 2.If it is a right tail test, then the area to the left is 1 - α.If it is a left tail test, then the area to the left is the significance level α.Choose Input constant and enter the area to the left of the critical value for the constant.Enter the degrees of freedom if you have a Student's t distribution.Choose Calc / Probability Distributions / t if you are using the Student's t distribution.Choose Calc / Probability Distributions / Normal if you are using the standard normal distribution.Minitab requires the area to the left of the critical value. That is, a left tail test should have a negative critical value, a right tail test should have a positive critical value, and a two tail test should have both a positive and negative critical value. There should always be as many critical values as tails and the signs should agree. Read your critical value(s) from the table.If you're using the normal distribution, go all the way to the bottom row. Use that column and go down until you find the proper degrees of freedom.Scan across that row and find your significance level α.Pick the appropriate row based on the type of test.
At the top of the t-table, there is a row for one tail areas and a row for two tail areas.This comes from the alternative hypothesis, H 1. Whether it is a one tail (left tail or right tail) or a two tail test.The default value used if no other value is given is α = 0.05. If you use a t distribution, you will also need to know the degrees of freedom. This is the standard normal distribution (z) for proportions or the Student's t distribution (t) for means. To look up a critical value, you need to know three things. You will need to put the dates on the assignment you turn in.
#2 sample t test minitab how to
There are common tasks needed for each of the questions, so I'm going to explain how to do each task in its own section rather than within the context of a particular problem. This document is set up a little bit differently than other set of instructions. Minitab Instructions for Hypothesis Testing Technology Exercises Minitab Instructions for Hypothesis Testing Technology Exercises