Calculate the 90% confidence interval (CI), the 95% CI, and the 99% CI given x-bar = 106, n = 30, and o- = 10. Observe how increasing the confidence level increases the interval size. a. 90% CI = [ __________ , __________ ] b. 95% CI = [ __________ , __________ ] c. 99% CI = [ __________ , __________ ]