2 Example Section A1.State the null hypothesis for your practical project. (4)2.Describe a method you would use to conduct your practical project. (19)3.Give an advantage of using an alternative experimental design in this practical project. (3)4.Assess the validity of your investigation in measuring the dependent variable. (6)5.Outline how you could select a sample which would be representative. (3)6.What ethical issues would you consider in designing your practical project? (3)7.Suggest one idea for possible future research related to your practical project. (3)
3 Experiments What can you remember about: The key features of the experimental methodHow you control variablesWhat the strengths and weaknesses of experiments areWhat are the different types of experimental design?Ext: strengths and weaknesses of types of experimental designExperimentsLOs:To recap key information about experimentsTo evaluate the strengths and weaknesses of the experimental methodTo apply this knowledge to the exam
4 Types of experimentLabFieldQuasiRemind me what these are???
6 Types of designIndependent measuresRepeated measuresMatched pairsComplete the description and evaluation worksheets. This is revision so should not take you more than 15 minutes.
7 Key definitions Independent variable: Dependent variable: E.g. red blood cell count
8 Alternate/Experimental Hypothesis H1 Key definitionsAlternate/Experimental Hypothesis H1A hypothesis is a testable, predictive statement. The hypothesis will state what the researcher expects to find out.When a hypothesis predicts the expected direction of the results it is referred to as a one-tailed hypothesis.When a hypothesis does not predict the expected direction of the results it is referred to as a two-tailed hypothesis.
9 How you should formulate your alternate or experimental hypothesis: There will be a significant difference between IV (operationalised) and DV (operationalised)There will be a significant difference between gender (male and female) and IQ (measured by their score on a 100 pt IQ test).Females will have a significantly higher IQ (measured by their score on a 100 pt IQ test) than males.
10 Key definitions Null Hypothesis H0 The null hypothesis is not the opposite of the alternate hypothesis it is a statement of no effect.The null states that there will be no difference as a result of the IV.There will be no difference between gender (male and female) and IQ (measured by their score on a 100 pt IQ test).
11 IV/DV Worksheet Null and Experimental Hypothesis In pairs identify the IV and DV and then the Experimental/Alternate Hypothesis and the Null Hypothesis
12 Design Task Ideas???? You have this info on your sheet. In groups outline your experimentWhat is your research question?AimsDesign and why it is goodTarget population and expected sampleSampling techniqueIV and DVGroups and allocation to themMaterials usedProcedureWhat extraneous variables there might beHow you will control extraneous variablesEthical issues to be consideredWhat form your data will take – how will you collect it and how will you analyse it?Will you have a control group?Inferential Statistics (we will cover this separately later)You have this info on your sheet.Always link your decisions to reliability and validity.
13 PlenaryExplain your research idea to the rest of the class.