Consider the following hypothesis test: $H_0: \mu ≤ 20$ $H_1: \mu>20$ A sample of 81 produced a sample mean of 20.55. The population standard deviation is 3. The value of the test statistic is:

1.85 -2.05 -2.15 1.65

1.65

The correct answer is Option (4) - 1.65