Question: Research Group A took a random sample from a population to estimate the prevalence of the common cold. The sample proportion was exactlyp^=0.20 and the

Research Group A took a random sample from a population to estimate the prevalence of the common cold. The sample proportion was exactlyp^=0.20

and the 95% confidence interval for the population prevalence was calculated as [0.10, 0.30].

Research Group B took a random sample from the same population to estimate the prevalence of the common cold. The sample proportion was also exactlyp^=0.20

and the 95% confidence interval for the population prevalence was calculated as [0.05, 0.35].

Which research group used a higher sample size?

Sample sizes are the same

Research Group A

Research Group B

Cannot be determined with information given

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