Assume that the sample is a simple random sample obtained from a normally distributed population of IQ scores of statistics professors. Use the table below to find the minimum sample size needed to be 95% confident that the sample standard deviation s is within 20% of o. Is this sample size practical? To be 95% confident that s is 1% 5% 10% 20% 30% 40% 50% within of the value of o, the sample size 19,205 768 192 48 "21 12 8 n should be at least To be 99% confident that s is 1% 5% 10% 20% 30% 40% 50% within of the value of o, the sample size 33,218 1,336 336 85 38 22 14 n should be at least The minimum sample size needed is Is this sample size practical?. O A. No, because the sample size should be as small as possible for most applications. O B. No, because the sample size is excessively large to be practical for most applications. O C. Yes, because the sample size is small enough to be practical for most applications. O D. Yes, because the sample size should be as large as possible for most applications. ts