Practice problems for set due Sunday, Nov 20 1) You draw a randOm sample of 6 introduction to statistics students, and measure each on how interested and how nervous they are about their course. The data are as follows. Compute the correlation between interest and nervousness within this sample using the zscore method. Subject num interest (X) nervous (Y) 1 3 5 2 1 4 3 2 5 4 4 3 5 2 4 6 5 2 2) Compute the standard error, conduct a Host and draw a conclusion. In a t-distribution with 4 degrees of freedom, 95% of values fall within +i- 2.78 3) Study and write out the following. The difference between an observational and experimental study. and what it means for causal inference. The difference between random assignment and random selection, and what each helps with