SPSS data analysis

Two Proportion test

Two proportion test is a hypothesis test that is used to determine whether the difference between two proportions is significant. This test figures out if the results are repeatable or valid. The two proportions test take a look at uses an ordinary approximation through default for calculating the speculation take a look at and self-assurance interval. The regular approximation can be used to estimate the distinction between binomial random variables which provided the model sizes are big, and size are not too near zero% or one hundred%. Similarly, while you state a test dissimilarity of 0 in the options of the sub-dialogue container, Minitab did Fisher's precise cheque, that's exact for the entire sample proportions and sizes. Fisher's genuine cheque is based on the distribution of hypergeometrics. The regular estimate may be imprecise for small numbers of activities or nonevents. If the wide variety of activities or nonevents in either pattern is fewer than five, Minitab shows a word. Fisher's genuine cheque is correct for all sample proportions and sizes. Decide whether the size of corporations fluctuates. Calculate a number values this is probably to consist of the distinction among the populace proportions. For instance, suppose you desired to understand whether or not the proportion of purchasers who go back a survey may be expanded with the aid of presenting an incentive inclusive of a product pattern.


  • Simply random values are selected for the data from both the populations
  • Both populations follow a binomial distribution
  • Samples are independent of each other
  • Accurate test results can be obtained when np and n(1-p) are greater than 5

Hypothesis of two sample Z proportion test

  • A null hypothesis is when the difference between population proportions is equal to the hypothesised difference.
  • Alternative hypothesis occurs when the difference between population proportions is not equal to the hypothesised difference. (two-tailed)
  • When the difference between population proportions is greater than the hypothesised difference, it is right-tailed.
  • When the difference between population proportions is less than the hypothesised difference (left-tailed
  • Two Sample Z Test of Proportions Variations

    Pooled two sample Z test of proportions formula

    Un-pooled two sample Z test of proportions formula

    How to execute Two Sample Proportion Hypothesis Test?

      1. State the null hypothesis and alternative hypothesis
      2. Determine the significance level
      3. Compute the test statistic
      4. Determine the critical value
      5. Define the rejection criteria
      6. Finally, interpret the result and decide if you should support or reject the null hypothesis.

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