please explain

A test is made of H": 1.1.: 18 versus H1: 11. at 18. A sample of size n = 45 isdraw'n. and x = 16. The population'standard deviation\" is o = 6. (a) Compute the value of. the test statistic z. (b) Is Ha rejected at the a: 0,0] level? (c) Is H0 rejected at the a: 0.05 leurd? (3] Compute the value of the test statistic. Round the answer to_- at least two decimal places. Choose the conect type of hypothesis test. Then nd the critical values for 11: 0.01 and a: 0.05. Round your answers to three dedmal places, if necessary. H 1 Critical \"alum for 11: 0.01 Critical "alum for a: 0.05; gums. D D O Righttaied E] E] Q Two-taied' and D and D