Zeena is 3 months old. She is taking part in a research study in which one end of a string is tied to her wrist and the other end is tied to a screen. When she moves her hand, the screen lifts and she can see a toy on the other side. How many days after learning this task will Zeena be able to remember it?

Toys that respond to the infant's actions, such as a jack-in-the-box,

A) discourage learning of cause-and-effect relationships. B) won't allow the infant to be in control. C) teach them that the environment is responding to them. D) create passive children.

Which of the following would not be considered one of the four different scales of measurement?

a. Nominal b. Ordinal c. Interval d. Decimal