Hypothesis

Hypothesis

1. Must Fulfill 3 Conditions

   • 1. They should predict that a difference will occur between one group and another (smokers and non-smokers)
   • 2. They should be precise statements which contains an IV and DV
   • 3. They should be refutable (or falsifiable) - capable of being proved wrong

2. Experimental Hypothesis

   • The Prediction of an affect on the DV. e.g. Old age pensioners love grapes.

3. Hull Hypothesis

   • Predicts no observable effect on the DV. e.g. There is no relationship between old age and loving grapes.
   • Means you are predicting that there will NOT be any relationship between two variables
     • E.g. "There is no relationship between smiling and wrinkles"
       • A null hypothesis means that chance factors have caused the results.
   • Why have a Null Hypothesis?
     • All good scientists should try to find evidence to support their null hypothesis to avoid bias.
     • If this is proved false, the experimental hypothesis must be true.

4. Tailed Hypothesis

   • One Tailed
     • Predicts the direction of the result.
       • e.g. "Being bullied at school will have a negative effect on exam performance".
     • A.K.A "Directional Hypothesis"
   • Two Tailed
     • This predicts there will be an effect, but doesn't sat in what direction.
       • e.g. "Being bullied at school will affect exam performance".
     • A.K.A "Non-directional hypothesis"