1) In a study, the sum of squared deviations for the sample is 26 and there are 5 participants. What is the estimated population variance? 2) A sample has individuals with scores of 1, 1, 5, and 7. What is the estimated population variance? 3) In a t test for dependent means, 26 participants are each tested twice (26 before scores and 26 after scores). What is the degrees of freedom? 4) Using a t test for dependent means, if the mean of the change scores is 42 and the estimated standard deviation of the distribution of means of the change scores is 7, the t score is ______.