The mean attention span for adults in a certain village is 15 minutes

The mean attention span for adults in a certain village is 15 minutes

The mean attention span for adults in a certain village is 15 minutes with a standard deviation of 6.4. The mean of all possible samples of size 30 taken from that population equals ____.In a t test, when the size of the sample is increased, the confidence interval ____.Assuming large between subject variability, which of the following tests is usually the most sensitive (N held constant)?t test for correlated groupssign testt test for independent groupsthey are all equal in sensitivityincreasesdecreasesstays the samechanges shapea and d15 0.5030 2.34