Problem 6. (2 points) What is the value of t*, the critical value of the t distribution for a sample of size 26, such that the probability of being greater than t* is 1%? t* = Problem 7. (4 points) Starting salaries of 125 college graduates who have taken a statistics course have a mean of $42,490. Suppose the distribution of this population is approximately normal and has a standard deviation of $10,627. Using a 75% confidence level, find both of the following: (NOTE: Do not use commas or dollar signs in your answers.) (a) The margin of error: (b) The confidence interval for the mean :