In a pre course, anonymous survey of students in her introductory statistics course, one of the authors asked her students how many hours per week they expected to spend studying statistics outside of class. Forty-nine students responded to that question, with an average of 8.2 hours and a SD of 3.79 hours. The data were not strongly skewed.
a. Identify the observational unit for this study.
b. Identify the variable of interest and whether it is categorical or quantitative.
c. Use the Th eory-Based Inference applet to calculate and report the 95% confidence interval for the parameter of interest.
d. In the context of this study, was it valid to use the theory-based (t-distribution) approach to find a confidence interval? Explain your reasoning.
e. Interpret the 95% confidence interval reported in part (c) in the context of the study.