Electricity has a negative production externality because a. a marginal external cost lowers the marginal benefit from consuming it b. the marginal private cost of producing it increases as more of it is produced c. its marginal benefit decreases as more of it is consumed d. the marginal social cost of producing it exceeds the marginal private cost of producing it

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]