"The psychological and social associates and implications of biological sex" defines which of the following?

When newborn kittens were exposed to either vertical or horizontal stripes—and nothing else—for several months, it was found that:

a. the kittens became completely blind. b. the kittens ran to play only when the researcher held up a bar matching their visual experience. c. the perception of vertical stripes is innate, and so some kittens functioned in a normal manner. d. the perception of horizontal stripes is innate, and so some kittens functioned in a normal manner.

The estimated standard error of the mean becomes a better predictor whenever the distribution of sample means

a. is skewed b. is bimodal c. is platykurtic d. none of these