Statistics - Hypothesis Test

A sample of 36 observations is selected from a normal population.
The average sample is 21 and the standard deviation of the sample is 5.
Perform the following hypothesis test using the significance level 0.05.
H₀: µ≤20
H₁: µ>20

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H0: The mean (µ) is less than or equal to 20

H1: The mean ...