4. It is claimed that the standard deviation for a national placement test is 100. A college professor feels that this i
Posted: Tue Nov 23, 2021 9:39 am
4. It is claimed that the standard deviation for a national placement test is 100. A college professor feels that this is too low, so he samples 300 scores and finds the sample standard deviation to be 110. Using a = 0.05, is the professor correct?