### Calculations with confidence interval for mean

Please help with the following problems. 1. For df = 25, determine the value of A that corresponds to each of the following probabilities: a.P(t > A) = 0.25 b. P( < A) = 0.10 c. P(-A < t < A) = .99 2. Given the following observations in a simple random sample from a population that is approximately normally distrib