Question

Data from a survey of a representative sample was used to estimate that 30% of computer users in 2011 had tried to get on a Wi-Fi network that was not their own in order to save money. Suppose you decide to conduct a survey to estimate this proportion for the current year. What is the required sample size if you want to estimate this proportion with a margin of error of 0.05? (Assume a 95% confidence level.) Calculate the required sample size first using 0.30 as a preliminary estimate of p. (Round your answer up to the nearest whole number.) n = Calculate the required sample size using the conservative value of 0.5. (Round your answer up to the nearest whole number.) n = How do the two sample sizes compare? The sample size from the conservative estimate of p gives the sample size. What sample size would you recommend for this study? The larger value since the relevant proportion could have changed since 2011. The smaller value since the relevant proportion could have changed since 2011. The larger value since the relevant proportion should have stayed the same since 2011. The smaller value since the relevant proportion should have stayed the same since 2011. It does not matter since the sample sizes are the same.

Answer 1