When Jane stopped paying attention to her daughter's tantrums, they stopped by the end of the day. However, according to the concept of _____, there is a possibility that her daughter might throw tantrums again the next morning

Sometimes, when one calls a customer service center, one is put on hold; one does not know how long it will be before the holding behavior is reinforced by the response of an associate, and it doesn't matter what one doesn't matter what one does in the meantime. Holding a phone line is reinforced on a ___ schedule.

a) fixed-interval b) fixed-ratio c) variable-interval d) variable- ratio

Which of the following is a major argument AGAINST the use of cross-sectional research designs in studying adult development?

a. They require too much time to collect data. b. They typically involve non-representative samples. c. They confound age and cohort. d. They do not allow comparisons of sub-groups, such as middle-class and working-class, or black and white.