Statistics

What you need to be able to do Identify an appropriate statistical test Explain your choice State a conclusion based on a stats test Write a null hypothesis Explain why a particular stats test was used

Descriptive Statistics Descriptive statistics give us a way to summarise and describe our data but do not allow us to make a conclusion related to our hypothesis. For example, measure of central tendency such as ____________, ___________ or ____________. It also includes graphs and charts, and measures of dispersion such as _________________ or ______________ _____________.

Tasks (use p144-5) Measure of central tendency Measure of dispersion Match the definitions to the terms, and the strengths and weaknesses. Measure of dispersion What is a range? Read about standard deviation What are bar charts and scatter graphs? Define and draw an example. Complete the memory experiment tasks

What is the point? Why do we bother to use inferential statistical tests? Inferential statistics allow us to draw conclusions from findings. They allow us to see whether our results are the result of something happening, or are just down to chance. Cross out the words on the sheet and fill in the table

Pg 20 Read the example about the chip bins and female drivers. Read “Using Statistical Tests” on pg 32- 33 Answer the questions on the sheet

Levels of significance This refers to the minimum probability we will accept that our results are due to chance. If it is too lenient, then our results may appear to be significant when in fact they are not. If it is too stringent, then our results may appear to be insignificant when they actually they are. In psychology, we generally aim for a significance level of _______%. This means that we can be _________% certain that our results are not due to chance. This is written as P≤_______

Example Read the example about biscuits On the sheet, cross out the right words and fill in the table

NOIR Levels of measurement Nominal Ordinal Interval Ratio Read the descriptions on the sheet give your own examples