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.
He probably only wants to ask questions, because thatâs what investigators do: they research. Scientists are investigators, so are police officers, and even your friend who reads lots of books about butterflies can be considered an investigator. Rooted in the Latin word vestigare, meaning âtrace out,â investigators gather facts in order to trace out the whole picture.