This tutorial talks about when exactly to use the Z table for hypothesis test.
Here, we use critical value to make decision.
NB: When testing for mean, the z table can be used on three different situations which are
1. When the sample size(n) is greater than or equal to 30 and the "population standard deviation" is given.
2. When the sample size(n) is greater than or equal to 30 and the "sample standard deviation" is given.
3. When the sample size(n) is less than 30 and the "sample standard deviation" is given.
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