Chapter 8 Confidence Intervals (Sample Size) Progress saved Score: 0/12 0/12 answered Done Question 1 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 = 26.7 dollars. You would like to be 95% confident that your estimate is within 10 dollar(s) of average spending on the birthday parties. How many moms do you have to sample? Do not round mid-calculation. Try this with your statistics calculator, if you increases the confidence level, the sample size increases decreases If you decreases the error bound, the sample size decreases O increases Question Help: ) Message instructor Submit Question SEW Rain. O 112 prt sc 19 144 16.com/courses/26867/assignments/742926?module_item_id=2191136 Chapter 8 Confidence Intervals (Sample Size) Progress saved Score: 0/12 0/12 answered Done Question 2 0/1 We want to obtain a sample to estimate a population mean. Based on previous evidence, researchers believe the population standard deviation is approximately o - 25.5. We would like to be 99.5% confident that the estimate is within 0.1 of the true population mean. How large of a sample size is required? Question Help: Message instructor Submit Question Rain. O hp prt 10 19 144e.com/courses/26867/assignments/742926?module_item_id=2191136 Chapter 8 Confidence Intervals (Sample Size) Score: 0/12 0/12 answered Progress saved Done Question 3 You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately o - 73.1. You would like to be 98% confident that your estimate is within 2.5 of the true population mean. How large of a sample size is required? Do not round mid-calculation. Question Help: Message instructor Submit Question Rain. O hp 10 19 144