A vet wants to determine the proportion of household pets that have pet insurance. What size sample should be used to estimate the proportion to within 0.06 with 90% confidence?

Which store do you think is more expensive—physical or online? A recent survey found that 45% of people aged 20 to 40 thought that physical stores were more expensive. To conduct a follow-up study that would provide 95% confidence that the point estimate is correct to within 0.05 of the population proportion, how many people aged 20 to 40 need to be sampled? (PHStat) To conduct a follow-up study that would provide 99% confidence that the point estimate is correct to within 0.05 of the population proportion, how many people aged 20 to 40 need to be sampled? (PHStat) Compare the results of (a) and (b).

If a 95% Confidence for the Population Proportion is (0.56, 0.78), fınd its Margin of Error.

Find the sample​ size, n, needed to estimate the percentage of adults who have consulted fortune tellers. Use a 0.09 margin of​ error, use a confidence level of 98​%, and use results from a prior poll suggesting that 18​% of adults have consulted fortune tellers. n=

Calculate the sample size for a 95% confidence level, Margin of error of 500 and population standard deviation of 4500. Show the formula and calculation. Round up to a whole number.