Probability and Significance

• Probability and significance


  A clear hypothesis must be outlined which can be either directional or non directional
• Directional Hypothesis 


  States which direction the findings are expected to take
• Non-directional hypothesis 


  Selected by a researcher when there is little or conflicting, evidence in that field of psychology and a clear outcome for the research is not certain
• One tailed test


  a directional hypothesis
• two tailed test


  a non directional hypothesis
• Type 1 error 


  In situations where the null hypothesis is rejected and the experimental hypothesis is accepted when it should've been the other way round
• type II error 


  when the researcher has accepted the null hypothesis and rejected the experimental hypothesis when it should have been the other way round