Using t test for testing the hypothesis that 2 means are equal

[Meisterbecker]

I need to test that average height in my data between two sexes is equal or not. I want to find the p-value for two sided and one sided t test. How can i do that?

[PaigeMiller]

Use PROC TTEST. See this example: https://documentation.sas.com/doc/en/pgmsascdc/9.4_3.4/statug/statug_ttest_gettingstarted02.htm

[ballardw · Accepted solution]

One of the SAS supplied data sets will actually allow use of your variables:

proc ttest data=sashelp.class;
  class sex;
  var height;
run;  

The grouping variable goes on a Class statement. Variables to test on the VAR statement. The SIDES= option on the Proc statement is used to control one or two sided and which direction for one sided. Sides=2 is the default, L for one-tailed lower or U for one-tailed upper. Make separate procedure calls with different Sides=. Hint: Use a Title statement with your code so you can tell which option is generating which output.

proc ttest data=sashelp.class sides=L;
  class sex;
  var height;
run;