Stats made easy
- Created by: Emily
- Created on: 27-08-13 11:06
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- STATS MADE EASY
- Hypothesis - a prediction we make about our experiment
- A non- directional (two-tailed) hypothesis - predicts that the IV will have an effect on the DV but doesn't say in a specific direction
- A null hypothesis - predicts nothing will happen
- Having more than two cups of coffee in the morning will have no effect on scores on a memory test
- A directional (one-tailed) hypothesis - predicts that the IV will have an effect on the DV but in a specific way
- Having more than two cups of coffee in the morning will increase the scores on a memory test compared to no coffee
- Data Analysis - Descriptive Statistics
- Mean - all scores are added together and divided by the number of scores
- all scores taken into account
- can be skewed by extreme scores
- CT
- Median - all scores put in order and the middle score identified
- not skewed by extreme scored
- does not take into account all scores and may be a fraction
- CT
- Mode - most commonly occurring score
- easy to calculate and shows us what we want
- May be several and ignores other scores
- CT
- Range - top value minus the bottom value
- Easy to calculate
- doesn't take into account all data and can be skewed by extreme scores
- D
- CT - Central Tendency
- D - Dispersion
- Standard Deviation - measure of the average amount that the scores differ from the mean.
- takes into account all scores gives and clear indication of dispersion
- difficult to calculate
- D
- Mean - all scores are added together and divided by the number of scores
- Probability and Significance
- Probability - how likely it is that something will happen
- getting heads when tossing a coin p=0.5
- scoring a six on a die p=0.16
- drawing a heart from a pack of cards p=0.25
- Probability in Psychology
- Probability is used to measure the significance of an experiment
- ACCEPTED SIGNIFICANCE - 5% - P=0.05
- If a result is significant (p=or0.05), then the nul hypothesis is accepted
- Probability - how likely it is that something will happen
- Hypothesis - a prediction we make about our experiment
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