Approximately what percentage of scores falls below the mean in a standard normal distribution?

Many individuals decide that they feel hungry and eat lunch when they see both hands of the clock on the 12, indicating that it is noontime. This may occur regardless of how recently they ate breakfast. In this example, the conditioned stimulus is ______

a. the food c. breakfast b. feeling hungry d. the hands of the clock

Identifying questions of interest, formulating an explanation, and carrying out research that either lends support to or refutes the explanation are all steps of which of the following?

a. scientific method c. collection of data b. theory d. observation