William Stern's formula for the intelligence quotient was mental age/chronological age × 100. What is the IQ of a 12-year-old with a mental age of 9?

For a scientific claim to be meaningful, it must be capable of being disproven. This is the critical thinking principle of _____

Fill in the blank with correct word

Psychologists sometimes prefer to make observations in a laboratory setting rather than a naturalistic setting. The primary advantage of laboratory observation over naturalistic observation is:

a. it costs less money. b. participants take their participation more seriously in a professional environment. c. researchers have more control over the research study. d. laboratory observation is more natural.