By age 6 months, infants typically display a smoother, more efficient movement when __________ with their __________ than their __________

A researcher has 50,000 students at his disposal for a research project. Out of this population,

he needs only 100 participants. This pool of participants is known as the __________ sample. Fill in the blanks with correct word

A beginning auto mechanic carefully observes a skilled mechanic perform a complex tune-up on a foreign car for the first time. What is the most likely reason that this beginning auto mechanic will be unable to perform this tune- up completely on his own?

a. He did not observe the skilled mechanic in enough detail and did not ask enough questions. b. He is not really motivated to become a mechanic. c. He is unable to remember all the steps, having observed the procedure only once. d. He is not coordinated enough to reproduce the procedure.