A recent experiment tested the hypothesis, "Listening to music while studying decreases test scores.” One group listened to music while they studied and one group did not listen to any music while they studied. After 30
minutes, they took a vocabulary test. what’s the independent and dependent variable?

Is the universal urge to strive for perfection in order to overcome feelings of inferiority. a. pleasure principle b. striving for superiority c. collective unconscious d. reality principle

  usually, loads of more than pounds require the assistance of a second person.           a. 40   b. 20   c. 50   d. 30

Without stratospheric ozone, which of the following would most likely occur? i. smog over major cities would be greatly reduced. ii. farms would produce surplus crops because of increased photosynthesis. iii. uv radiation would damage phytoplankton and reduce populations of aquatic consumers. i only ii only iii only i and ii i and iii