Question 9 2 pts (CO 4) Determine the minimum sample size required when you want to be 75% confident that the sample mean is within twenty-five units of the population mean. Assume a standard deviation of 327.8 in a normally distributed population 661 228 466 283 Question 10 2 pts (CO 4) In a sample of 8 high school students, they spent an average of 28.8 hours each week doing sports with a standard deviation of 3.2 hours. Find the 95% confidence interval. (22.47, 35.21) (25.62, 32.48) (24.10, 34.50) (26.12, 31.48)