ou should complete the table as part of the procedure of finding the variance and standard deviation.   Xi           (Xi-(mu))       | (Xi-(mu)) | 49    53

Suppose that an accounting firm does a study to determine the time needed to complete one person's tax forms. It randomly surveys 200 people. The sample mean is 22.3 hours. There is a known population standard deviation of 7.0 hours. The population distribution is assumed to be normal. Find the following. (Enter exact numbers as integers, fractions, or decimals.) (i)     x =  (ii)     ? =  (iii)     n =

In my last question, the formular for a & b is correct, however, the same formular for c is not...The difference should be "20" but I'm not sure why this isn't calculating to "20". Here's the question: A random sample of 24 items is drawn from a population whose standard deviation is unknown. The sample mean is x¯ = 880 and the sample standard deviation is s = 5.       (c) Construct an interval estimate of μ with 99% confidence,  assuming that s = 20.          =880-20/SQRT(24)*2.81 = 868.528 =880+20/SQRT(24)*2.81 = 891.472

what do the mean deviation, variance and standard deviation all have in common? How is this helpful with the calculations of these variabvariables.