What two special characteristics do collective goods possess?

To control for experimenter effects, the

A) participant is kept blind to the nature of the independent variable. B) participant is kept blind to the hypothesis of the study. C) researcher's direct contact and knowledge about the participants is reduced. D) researcher's direct contact with participants is increased.

Use the gssFT2012.dta (note “FT”—not the gss2012.dtav) data file to answer the following question. Create a table that shows the average income (coninc) by level of happiness (happy). In your table, format the numbers so there are only whole numbers or no numbers to the right of the decimal point. Then, test whether the average income is the same for each level of happiness.

Can you reject the null hypothesis or hypotheses that you identified in part A?