Approximately what percentage of scores are between z = 1 and z = 2?

IQs of Americans have gone up about __________ point(s) per decade since 1940

a) 1 b) 2 c) 3 d) 4

Lewy bodies are abnormal clumps of protein found in both patients with Parkinson's disease and patients with depression.

Answer the following statement true (T) or false (F)