12:44 Done myopenmath.com AA C Chapter 8: Confidence Intervals (Proportions) Score: 0/6 0/6 answered Progress saved Done . . . . Question 1 B 0/1 pt '0 3 8 99 G) Details 0.. You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately 81%. You would like to be 95% confident that your estimate is within 2% of the true population proportion. How large of a sample size is required? Hint: Video 5'7 [+] Done 9 myopenmath.com AA C, Chapter 8 Confidence Intervals (Sample Size) Score: 0/7 0/7 answered Progresssaved Done lg (33 {6' 0 Question 7 v B 0/1 pt '0 3 8 99 G) Details 0.. 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 approximatelyo = 69.1 dollars. You would like to be 90% confident that your estimate is within 4 dollar(s) of average spending on the birthday parties. How many parents do you have to sample? Hint: Video E'T' [+] Done 9 myopenmath.com AA C, Chapter 8 Confidence Intervals (Sample Size) Score: 0/7 0/7 answered Progresssaved' Done lg (33 {6' 0 Question 6 v B 0/1 pt '0 3 8 99 G) Details 0.. You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately a = 74.6. You would like to be 90% confident that your estimate is within 4 of the true population mean. How large of a sample size is required? Hint: Video 5'7 [+] Submit