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.
Definition of probe for English Language Learners. : 1  to ask a lot of questions in order to find secret or hidden information about someone or something. : 2  to touch or reach into (something) by using your finger, a long tool, etc., in order to see or find something. : 3  to look into or examine (something) carefully.