题目内容
Research means a systematic investigation, including research development, testing and evaluation, designed to develop or contribute to generalizable knowledge.
查看答案
搜索结果不匹配？点我反馈
更多问题
For a primary research, data does not exist at the beginning of the study and a researcher has to collect the data using appropriate methods.
An observational study involve interventions on the part of the investigator and its data is descriptive.
Case reports and case series studies describe the experience of a single patient or a group of patients with a similar diagnosis.
Case reports can be used to test the presence of a statistical association.
微信支付 
支付宝支付