Statistics > Test for a Mean
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QuickNotes™  

Test for a Mean

  • If the population is normal and n < 30 or if n ≥ 30 from any distribution, use the normal distribution when constructing a test statistic for testing μ when the population standard deviation is known.

  • If the population is normal and n < 30, use the t-distribution with ν = n − 1 degrees of freedom when constructing a test statistic for testing μ when the population standard deviation is unknown.