Research Methods 2

Week 12: The power of a hypothesis test

Aims

To understand the errors that can be made when using hypothesis tests and to appreciate how these can be controlled

Objectives

To understand the ways in which the results of a hypothesis test can be in error

To know the terms 'Type I error' , 'Type II error' and 'Power'

To know that the power of a test depends on the true difference and the sample size

To appreciate, in qualitative terms, how the idea of power can be used to estimate the number of subjects needed for a study
 

This week there is one document to be studied, with an accompanying exercise sheet.

• Study the document  The Power of a Hypothesis Test, which explains the key ideas and can be found in the Learning Materials folder.
• Go to the Formative Assessment Activities folder and attempt the questions in Exercise Sheet 1.

{to obtain the macro ttestpow click here}
• You should check your answers by referring to the Solutions to Exercise Sheet 1.