A least squares adjustment is computedtwice on a data set. When the data is minimally constrained with 20degrees of freedom, a reference variance of 0.69 is obtained. Inthe second run, the fully-constrained network also having 20degrees of freedom has a reference variance of 1.89. The a prioriestimate for the reference variance in both adjustments is 1;
a. Is theminimally-constrained adjustment reference variance statisticallyequal to 1 at a 0.05 level of significance?
b. Is thefully-constrained adjustment reference variance statistically equalto 1 at a 0.05 level of significance?
c. Are the twovariances statistically equal at a 0.05 level of significance?
d. Is therestatistical reason to be concerned about the presence of errors ineither the control or the observations?
