Karen pays a trainer to enforce her fitness plan, despite the fact that she is capable of doing the routine on her own and could save money by not using the trainer. neoclassical payoff-maximizing economic models would not predict this outcome, given that they assume people

True or false: a fitted model with more predictors will necessarily have a lower training set error than a model with fewer predictors.

Using a cps-sample of 7,440 individuals, you estimate the following regression: = 20.91 - 2.61 x female where female is a binary variable that takes on the value of 1 for females and is 0 otherwise. the standard error on the coefficient on female is 0.25. the 95% confidence interval for the gender wage gap, or the amount that females earn less, is: a) [-3.10, -2.12] b) [18.30, 23.52] c) [-3.02, -2.20] d) [-1.96, -1.64]

In macroeconomics, to study the aggregate means to study blank