A Researcher Wants to Estimate the Proportion of Millennials Who

Multiple Choice

A researcher wants to estimate the proportion of Millennials who regularly listen to podcasts (defined as at least two entire podcasts per week) .Previous studies indicate that only 18% of Millennials listen regularly to podcasts, and this researcher wants to estimate if that figure has increased.For this purpose, the researcher will use a 98% confidence level and wants to estimate the population proportion within 0.05 (i.e., 5 percentage points) of the actual value.The approximate sample size is at least ______.

A) 47
B) 48
C) 318
D) 321
E) 331