What are the degrees of freedom for an independent-samples t-test using one sample with n = 13 and one sample with n = 15?

Overt aggressiveness in females does not confer an advantage and may even confer a disadvantage

Indicate whether the statement is true or false

The child's social referencing first becomes evident by the early age of about

a. two months. b. seven months. c. 15 months. d. three years.