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Choosing which statistical test to use. There are many different tests you can use in statistics. Sometimes it can be quite difficult to know which is the correct test to use. This video will talk about seven tests you are likely to use. involving means proportions and relationships. When you are trying to work out which is the most appropriate test there are three questions you should ask One. What level of measurement was used for the data we are analyzing. 2. How many samples do we have? 3. What is the purpose of our analysis? I will now explain each of these questions 1. Data or level of measurement Is our data nominal or interval/ratio? Nominal data is also called categorical, qualitative or nonparametric Examples of nominal data are color whether parts are defective or not, or preferred type of chocolate. Nominal summary values are usually stated as frequencies, proportions or percentages. The tests that involve nominal data are: Test for a proportion Difference of two proportio
