What proportion of 18- to 29-year-olds use a social networking site to keep in contact with friends?

A new measure for anxiety correlates highly with the Beck Anxiety Inventory. This new measure is demonstrating

a. discriminant validity. b. convergent validity. c. construct validity. d. predictive validity.

Which of the following substances is released from the intestines, causes eating to cease, and shows promise in the treatment of obesity?

a. neuropeptide Y. b. glucagon-like peptide 1 c. BMI. d. insulin.