What test (i.e, what command in Stata) do you need to run to test the null hypothesis that, holding other factors fixed, age has no effect on sleeping? Suppose that age is the variable age in the dataset, and age2 is the variable agesq in the dataset.

1 Using the data in SLEEP75 (see also Problem 3 in Chapter 3), we obtain the estimated equation (1&5 = 3,840.83 .163 totwrk 11.71 educ 8.70 age (235.11) (.018) (5.86) (11.21) + .128 age2 + 87.75 male (.134) (34.33) n = 706,R2 = .123, R2 = .117. The variable sleep is total minutes per week spent sleeping at night, totwrk is total weekly minutes spent working, educ and age are measured in years, and male is a gender dummy