Chapter 3 Confidence Intervals (Sample Size) 32-\"? I 1 A political candidate has asked you to conduct a poll to determine what percentage of people support her. If the candidate only wants a 1.59:\" margin of error at a 91535- confidence level, what size of sample is needed? 1|nI'hen finding the z-value, round it to four decimal places. You want to obtain a sample to estimate a population proportion. At this point in time, you have no reasonable preliminary estimation for the population proportion. You would like to be 9855 confident that you estimate is within 2.595 of the true population proportion. How large of a sample size is required? Hint: Video E' [+] Chapter 8 Confidence Intervals (Sample Size) 17 3 A political candidate has asked you to conduct a poll to determine what percentage of people support her. If the candidate only wants a 4% margin of error at a 99% confidence level, what size of sample is needed? When finding the z-value, round it to four decimal places. Hint: Video ' [+]Chapter 8 Confidence Intervals (Sample Size) 1.5? P noun-grad You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately p = 0.22. You 1would like to be 995%- oonfident that your esimate is within 355:1 of the true population proportion. How large of a sample size is required? Hint: video' [+] Chapter 8 Confidence Intervals (Sample Size) 0/7 ; 15 You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately 13%. You would like to be 90% confident that your estimate is within 5% of the true population proportion. How large of a sample size is required? Hint: Video ' [+] 1 =Chapter 8 Confidence Intervals (Sample Size) 0/7 answered 6 You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately o = 31.1. You would like to be 99% confident that your estimate is within 1.5 of the true population mean. How large of a sample size is required? Hint: Video ' [+] D =Chapter 8 Confidence Intervals (Sample Size) 0/7 ar n 7 You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based on previous study, you believe the population standard deviation is approximately o = 77.8 dollars. You would like to be 95% confident that your estimate is within 3 dollar(s) of average spending on the birthday parties. How many parents do you have to sample? Hint: Video ' [+] n =