Te problem:

According to the government, 23% of all American adults have more than one job. A random survey of 68 adults finds that 21 of them hold more than one job. At the 5% level of significance, can we accept the government's claim?

Let me see, I have the (sorry don't know how to write formula on here)

H0: mu = .23 which is the stated average by the government.

H1: mu not = .23

alpha = 0.05

n= 68

x bar= .309 (percentage of sample 21/68 = .309)

I am at a loss here. Maybe I am stupid, but I don't see enough info to get a standard deviation and complete the problem. Am I missing something? Someobody help me please.

By the way... there are a few more problems I will post seperately because I am dying here.