1. 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 99% confident that you estimate is within 4% of the true population proportion. How large of a sample size is required? ( )

2. A political candidate has asked you to conduct a poll to determine what percentage of people support her. If the candidate only wants a 3% 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. ( )

3. You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately p = 0.69. You would like to be 95% confident that your estimate is within 5% of the true population proportion. How large of a sample size is required? ( )

4. You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately 12%. You would like to be 98% confident that your estimate is within 1.5% of the true population proportion. How large of a sample size is required? ( )

5. You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately=35.6. You would like to be 98% confident that your estimate is within 2 of the true population mean. How large of a sample size is required? ( )

6. 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=27.4dollars. You would like to be 90% confident that your estimate is within 2.5 dollar(s) of average spending on the birthday parties. How many parents do you have to sample? ( )