Question

Assume that the sample is a simple random sample obtained from a normally distbuted population of IQsores of stics professors. Use the below to find the minimum sample size needed to be 95% confident that the sample standard deviations is within 40% of a Is this sample size practical To be 95% confident that is within 13 % 100 2 3 4 5 of the value of the sample size I should be at least 19.205 768 1024 21 28 To be confident that is within 13.10.2013 40% son of the value of the sample sire n whold be at least 33.21 1.336 336 36 38 22 14 The minimum sample size needed is Is this sample we practical? O A No, because the sample size is excessively large to be practical for most com OB. Yes, because the sample size should be as large as possible for most icon OC. Yes, because the sample size is small enough to be practical for most applications OD. No, because the sample sice should be as small as possible for most applications

Answer 1

from given table,

minimum sample size required = 12

yes, because the sample size is small enough to be practical for most applications