Textbook ExpertVerified Tutor
10 Nov 2021
Given information
The confidence level is 90% and the margin of error for the population proportions is 0.05. The task is to find the minimum sample size necessary.
Step-by-step explanation
Step 1.
The formula for the margin of error E for a population proportion is:
where is the probability of a success, , the probability of failure given by , is the necessary sample size and is the critical z score for a 90% confidence interval.
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