STATISTICAL TECHNIQUES AND TOOLS
CONFIDENCE INTERVALS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A preliminary study suggests that 87% of people agree on an issue. How large must your sample size be so you could be within ± 3% of p at 90% confidence?
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78
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466
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145
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338
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Explanation:
Detailed explanation-1: -Answer: As sample size increases, the margin of error decreases. As the variability in the population increases, the margin of error increases. As the confidence level increases, the margin of error increases.
Detailed explanation-2: -The confidence interval at the 95% level of confidence for the true population proportion was reported to be (0.750, 0.950).
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