Twelve year old Jerry has an IQ of 75 on the original version of the Stanford Binet. His mental age is:

If every individual in the population has an equal chance of being selected for a sample, the sample is said to be a(n) ____________________ sample

Fill in the blank(s) with correct word

Dr. Trujillo is conducting studies on classical conditioning and experimenting on the effect of sometimes presenting the unconditioned stimulus without the neutral stimulus. She is investigating the element of ____

a. ?contingency b. ?habituation c. ?contiguity d. ?instrumentality