Question

A study is done in sydney to estimate the proportion of people living there who travelled outside of Austaralia .Previous research has found that this proportion is equal to roughly 28%. Find the minimum sample size needed for the study in order to obtain a minimum of 5% margin of error in an apporximate 95% confidence interval for this proportion if k=1.96

Answer 1

Step-by-step explanation:

To obtain a 3 percent margin of error at a 90 percent level of confidence requires a sample size of about 750. For a 95 percent level of confidence, the sample size would be about 1,000. Determining the margin of error at various levels of confidence is easy.

Answer 2

Answer:

Step-by-step explanation:

To obtain a 3 percent margin of error at a 90 percent level of confidence requires a sample size of about 750. For a 95 percent level of confidence, the sample size would be about 1,000. Determining the margin of error at various levels of confidence is easy.