Conducting a Hypothesis Test Using Proportions. Note: a proportion is the same as the percentage of the population. Formula for the z test for proportions:. ( X – µ ). ( X – np ). z =. or. σ. √ npq. Where:. µ =. np. σ =. √ (npq). q =. 1 – p. Steps for Hypothesis Test.
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Conducting a Hypothesis Test
Note: a proportion is the same as the percentage of the population
Formula for the z test
( X – µ )
( X – np )
1 – p
Steps for Hypothesis Test
State the null and alternative hypotheses (using p)
Find the mean and standard deviation
Find the critical value(s) using z-table
Compute the test value
(Round to 2 decimals)
Make the decision to either “reject the null” or “not reject the null”