Stats

Stats

1. Data

   • Nominal
     • Categories
     • Frequency
     • Chi Square
   • Ordinal
     • Ranked data
     • No mathematical meaning
   • Interval
     • Measured
     • Mathematical meaning

2. Level of Significance

   • Probability that chance factors are responsible for results
   • Usually P<0.05
   • Significant
     • Reject null
     • Accept experimental
   • Not significant
     • Reject experimental
     • Retain null

3. Errors

   • Type 1
     • P–value is too lenient
     • It is significant when it isn't
   • Type 2
     • P-value is too stringent
     • Caused by chance

4. Decision table

5. Observed/Critical value

   • Enables us to calculate whether a result is significant
   • Degrees of freedom
   • One/Two tailed
   • Significance level
   • Compared to critical values table

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