Chapter 09, Section 9.2, Problem 020a
A random sample of 113 observations produced a sample mean of 30. Find the critical and observed values of z for the following test of hypothesis using α=0.1. The population standard deviation is known to be 6 and the population distribution is normal.
H0: μ = 28 versus H1: μ ≠ 28.
Round your answers to two decimal places.
zcritical left =
zcritical right =
zobserved =
Chapter 09, Section 9.2, Problem 020b
A random sample of 119 observations produced a sample mean of 29. Find the critical and observed values of z for the following test of hypothesis using α=0.1. The population standard deviation is known to be 7 and the population distribution is normal.
H0: μ = 28 versus H1: μ > 28.
Round your answers to two decimal places.
zcritical =
zobserved =