A sample mean, sample size, and population standard deviation are given. Use the one-mean z-test to perform the required hypothesis test at the given significance level. Use the critical -value approach. x bar = 51, n = 48 , o = 3.6, Ho: u = 50; Ha: u > 50, a = 0.01 Zc98% =2.326 O z = 0.28; critical value = 2.33; do not reject Ho O z=1.92; critical value = 2.33; do not reject Ho O z= 1.92; critical value = 1.33; reject Ho O z= 1.92; critical value = 2.33; reject Ho