1. You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately=60.8=60.8. You would like to be 99% confident that your estimate is within 1 of the true population mean. How large of a sample size is required?Do not round mid-calculation. n= 24531
2. 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=51.6=51.6dollars. You would like to be 90% confident that your estimate is within 1.5 dollar(s) of average spending on the birthday parties. How many moms do you have to sample?Do not round mid-calculation. n= 3203.
3. Based on historical data in Oxnard college, we believe that 31% of freshmen do not visit their counselors regularly. For this year, you would like to obtain a new sample to estimate the proportiton of freshmen who do not visit their counselors regularly. You would like to be 99% confident that your estimate is within 1% of the true population proportion. How large of a sample size is required?Do not round mid-calculation. n= 14194

all 3 of my answers are incorrect