In order to determine an interval for the mean of a population with unknown standard deviation a sample of 61 items is selected. The mean of the sample is determined to be 23. The number of degrees of freedom for reading the t value is a. 22 b. 23 c. 60 d. 61.
Learner's definition of INVESTIGATE 1 : to try to find out the facts about (something, such as a crime or an accident) in order to learn how it happened, who did it, etc.
Research is work that involves studying something and trying to discover facts about it. You say that someone does, conducts, or carries out research. I had come to India to do some research into Anglo-Indian literature. You can refer to the research that someone is doing as their research or their researches. You normally only use researches after a possessive form such as my, his, or Gordon's. Soon after, Faraday began his researches into electricity.