According to research presented in the text, older adults typically sleep about _____ hours a night, although they stay in bed about ____ hours per night:

Neurons in the LGN respond to colors as predicted by the ______ theory

Fill in the blank(s) with the appropriate word(s).

The null hypothesis for a two-tailed independent-groups t test states that a. H0: m1 ¹ m2

b. H0: m1 = m2. c. Ha: m1 ¹ m2. d. Ha: m1 = m2.