1. (20 pts) Stats trivia: answer the following questions to get \"warmed up\" for this exam: (a) (2) Identify the sampling method(s) being used here: group people according to the rst letter of their last name, then randomly select people whose last names start with A, D, K, P, or W and ask them some questions about their political beliefs. (b) (2) TRUE or FALSE: A well-designed observational study can be used to establish causation between two variables. (c) (2) Final exam scores in ENGL 105 are normally distributed with mean 78 points. If an exam score of 90 has a calculated zscore of 1.50, what is the standard deviation of these test scores? (d) (2) TRUE or FALSE: There are innitely many possible outcomes in the sample space for a geometric random variable. (e) (2) If A and B are disjoint events, what is P(A|B)? (f) (2) TRUE or FALSE: The mean and median for a normal random variable are always the same value. (g) (4) Armando's commute time to work on any given weekday follows a normal distribution with p. = 15 minutes and a = 3 minutes. If we decided to observe his commute times on 10 (independent) weekdays and count the number of commutes that took longer than 15 minutes, what kind of random variable would we be working with? Give me the name and any relevant parameter(s). (h) (2) Which of the images below appears to display the strongest negative association? 'I 0 '05 HE I! to