A researcher conducts a survey of university students in which she asks whether they had ever tried LSD. Knowing that her previous research has shown a higher rate of drug use in general by males, the researcher hypotheses that males will also report higher use of LSD than females. Conduct an independent proportions z-test to test her hypothesis (assumea = .05, one-tailed)

Males: 18 out of 35

Females: 11 out of 28