Please help me with 4 questions

About 300 billion dollars in taxes is lost in the united states alone due to an underground economy, which involves paying individuals cash rather than having them on the official payroll. a. true b. false

In which type of economy are these decisions made by the producers , consumers, and the goverment?

Pj conducts an experimental study on the effects of soft music during high stakes science testing. he randomly assigns students at the school. in one condition he does not provide music for testing while in the other group he does provide the music. he administers a pretest at the beginning of the year and a posttest at the end of the year. pj’s design is best described as a: a. static group comparisonb. pretest-posttest control group designc. control-group-time-series designd. nonrandomized control-group pretest-posttest design