In 2010, Kirschner and Karpinski studied social media use among college students (their original study can be found https://doi.org/10.1016/j.chb.2010.03.024here). At the time, Facebook was the most prominent social media platform, and so their study focused on Facebook usage. In a random sample of 141 college students who use Facebook, the researchers found that 104 of those students reported

that using Facebook did not impact their academic performance (in a positive or negative way).

(a) What parameter can be estimated based on this sample?

(b) Construct a 90% confidence interval for this parameter (be sure you check the conditions for normal approximation!)