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Experimental Research Methods (Fach) / L1 (Lektion)
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- Two ways to summarize data 1. with a distribution -frequency distribution -histogram 2. Sample satatistics -central tendency->mean median mode -dispersion -> variance standard deviation
- inferential statistics nneeded if we do not have data of the entire population with inferential statistics we can draw conclusions about a population based on a sample
- three procedures in inferential statistics hypothesis testing point estimation interval estimation-> confidence intervals
- hypothesis testing in hypothesis testing you examine whether the mean of a population is equal to a certain value or not hypothesis are exlusive it either is equal or not and exhaustive cover all options
- 4 steps of hypothesis testing 1.formulate hypothesis H0 2. determine decision rule a 3. determine p-value based on spss output 4.decision on significance and conclusion
- point estimation used to answer what is the best guess of this parameter
- Interval estimation what is the interval in qhich the value of the parameter lies with % confidence
- data numerical information of a population or sample
- population all members of a defined group
- parameters measures of properties of scores in the population
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- sample subset of memebers of a defined group
- sample statistics are measures of properties of the scores in the sample