1. I generated some data (regressoin analysis). How do i find a standard error for the estimated regression coefficient? (with or without minitab, either is fine)

2. I generated the anova table (see below), but how do i find the estimate of sigma^2?

3. How do i do an F-test and t-test in minitab or outside minitab (by hand)?

4. I calculated the 95% confidence interval using the formula given in my notes (see below), but how do i do it for the 4th value of the explanatory variable?

Many thanks.