Suppose we want to test Ho: p = 12.8 against H1: p

Suppose we want to test Ho: p = 12.8 against HI: p < 12.8. The sample mean and sample standard deviation are 12_1 and 3.8 respectively from a random sample of size n = 60. Assume population standard deviation is unknown. Calculate the test statistics. [Hints: The respective test statistics for hypothesis test of population mean (p) with known population standard deviation (o) and unknown population standard deviation (o) are: z and x-/lo