Which preconditions have to be fulfilled that I can apply a z-Test here? Is it 0.47*125 5 and (1-0.47)*1255 OR 0.44*1255 and (1-0.44)*1255 OR BOTH?

Which preconditions have to be fulfilled that I can apply a z-Test here? Is it 0.47125 5 and (1-0.47)1255 OR 0.441255 and (1-0.44)1255 OR BOTH?

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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?

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