Most symbols and abbreviations that are not Greek letters are italicized: df p N n t z F SD SE M OR. All symbols should be italicized: t, F, z.

Should SD be capitalized?

In general, cardinal directions such as north, south, east and west are not capitalized. However, because the direction is part of the state name in some state, such as South Dakota, the direction must be capitalized. That's because they become a proper noun.

How do you write mean and SD in APA?

APA style is very precise about these. Mean and Standard Deviation are most clearly presented in parentheses: The sample as a whole was relatively young (M = 19.22, SD = 3.45). The average age of students was 19.22 years (SD = 3.45).