Which preconditions have to be fulfilled that I can apply a z-Test here? Is it 0.47*125
Environmental health indicators include air quality, water quality, and food quality. Suppose
that 25 years ago, 47% of food samples contained pesticide residues (i.e. take this as a
population value). In a recent study, 44 of 125 food samples contained pesticide residues.
State the hypotheses that can be used to test whether the population proportion has
declined. Use a = 0.01. What is your conclusion?