A sample mean, sample size, and population standard deviation are provided below. Use the one-mean z-test to perform the required hypothesis test at the 5% significance level. x = 38, n = 20, o =5, Ho: H= 34, Ha: H> 34 Click here to view a partial table of areas under the standard normal curve. . . . The test statistic is z = (Round to two decimal places as needed.)