library research - correct answerinvolves ivestigation of books, jernals, periodicals, databases and stored
records.
observational research - correct answerincludes one or more persons observing and recording facts
about an activity
primary sources - correct answeroriginal information about a topic not yet published or created
reliability - correct answer...
secondary sources - correct answermaterial already published or created about the topic
survy research - correct answer...
validity - correct answer...
variable group - correct answer...