Stats made easy

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  • 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
    • 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

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