Grammatically Correct: The writer's essential guide to punctuation ...

PUNCTUATION
BETTER: A validity coefficient cannot exceed the square root of the
reliability coefficient. (For example, if the reliability of a test is .70, the
test validity cannot exceed .83.) If it does, a sampling error has occurred.
SETTING OFF DETAILS
Parentheses are employed to set off a variety of small details that
may need to be worked into a sentence. Some common examples
of this type of use are listed below.
SHORT CLARIFICATIONS
The settlement is 80 kilometers (about 50 miles) from the nearest town.
The one-way fare is $200 (U.S.).
TELEPHONE AREA CODES
For directory information for New York City, dial (212) 555-1212.
BIRTIIIDEATH DATES
Marie Curie (1867-1934) was the first person to be awarded a second
Nobel prize.
NUMBERS OR LETTERS USED FOR LISTING ITEMS
For lists run in with the regular text, the numbers may be set
off either with parentheses on both sides or with just a closing
parenthesis.
Look for the following features in a good word processing system: (1)
spell-checking, (2) grammar-checking, (3) word count and (4) some
minor graphics abilities.
Look for the following features in a good word processing system: 1)
spell-checking, 2) grammar-checking, 3) word count and 4) some
minor graphics abilities.
For list items laid out with vertical spacing, the numbers or letters
may be set off with full parentheses, closing parentheses, colons,
periods, hyphens or dashes.
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