The psychology department at UBC wants to observe the effect of club involvement on academic performance and randomly selects 1500 students from first-year classes proportionally representing each faculty. Students are randomly assigned to ioin either a social. hobby, academic, or community service club, and their grades at the end of the year are measured (by percentage). The principal investigator wants to determine whether the type at club iained in their first-year affects their grades. Part a) What kind of study is this? 0 A. Experimental study (Q B. Observation study 0 C. Neither Part b) What sampling method was employed in selecting the students? 0 A. Simple random sampling 0 B. Systematic sampling 0 C. Multistage sampling D. Stratified random sampling Part c) What is the target population that the study is interested in? A. UBC firstyear students 0 B. Different clubs at UBC O C. UBC students 0 D. Faculty at UBC Part d) Whioh ot the following statements is correct about the type of club a student is assigned to join? A. It is the parameter. 0 B. It is a variable of interest. 0 c. It is a statistic Part e) What graphical display is the most appropriate for comparing the grade distribution depending on the type of club ioined? A. A bar chart 0 B. A scatterplot O c. Side-by-side boxplots O D. A stem-and-leat display