p-value is a measure of the strength of the evidence against the H0 Definition: p-value is the probability of getting the observed value of the test statistic, or a value with even greater evidence against H0, if the H0 is true the smaller the p-value the greater evidence against H0

For normal distribution

  1. Choose a significance level
  2. Calculate Z
  3. Get p-value for Z (from table)
  4. Check if Z higher/lower then significance level