The univariate confidence intervals are illustrated with the oxygen uptake
example (see Example 4.8). s^2 = 7.4276 was estimated with 26 degrees of
freedom. The value of Student’s t for α = .05 and 26 degrees of freedom is
t_((.025,26) )= 2.056. The point estimates of the parameters and the estimated
variance-covariance matrix of β ̂were