3 points Ali is doing a study to determine whether how long a student sleeps affects test scores of that student. Ali deduced that the willingness to sleep early also has an effect. There are three variables in this study; one is the independent variable, another is the dependent variable, and the last one is the moderating variable. Please specify the three of them. * Independent: Willingness to sleep early; Dependent: Length of time spent sleeping; Moderating: Test score Independent: Length of time spent sleeping; Dependent: Test score; Moderating: Willingness to sleep early Independent: Test score, Dependent: Length of time spent sleeping; Moderating: Willingness to sleep early Independent: Length of time spent sleeping; Dependent: Willingness to sleep early; Moderating: Test score 2 points What is the role of preliminary information gathering in research?* It helps us narrow the broad management problem into a feasible topic for research. It helps us successfully conduct the regression analysis. It helps us calculate the required sample size. It helps us broaden the problem area