X^2

• Chi squared test

  Used to determine whether the outcome of an experiment is due to chance or whether something else has affected the Outcome
• null hypothesis

  H0 there is no relationship between the observed and expected frequency
• alternative hypothesis

  H1 there is a relationship between the observed and expected frequency
• degrees of freedom

  the amount of data sets determines the degree of freedom

  n-1

  n= no. of data sets/outcomes
• critical value

  this is the value our chi squared value needs to be above to reject the null hypothesis and accept the alternative hypothesis

  always use p=0.05
• the chi squared test

  collect data and total

  calculate expected frequency

  chi squared equation=

  
• observed frequency

  what you got after doing the cross
• expected frequency

  what you think you should get if it is mendelian inheritance