Asurvey reports the percentage of people 18 years of age and older who smoke. suppose that a study designed to collect new data on smokers and nonsmokers uses a preliminary estimate of the proportion that smoke of 0.2.how large a sample should be taken to know with 95% confidence the proportion of smokers within ± 0.02 of the true population proportion?

i am thinking c. sorry if im wrong .

step-by-step explanation:

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have

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step-by-step explanation: