2. A stock market trader buys 100 shares of stock A and 200 shares of stock B. Let X and Y be the price changes of A and B, respectively, over a certain time period. Assume the joint PMF of X and Y is uniform over the set of integers x and y satisfying -2 sxs2, x - 1 sysx+1. Are X and Y independent? Explain.

Which of the following sets are linearly dependent? Select all possible answers. 3 9 4 12 |} 3 -2 { 2 1 } 3 1 21 { -14 } 7 000 0000 { } -3 7 4 { 2 -2 } -3

if you score on your next statics says is converted to a z-score, which of these z-scores would you prefer?

The data indicate the number of wins and the number of goals scored for teams in the National Hockey League after the first month of the season. No. of wins, x B 5 6 9 10 0.885 Part: 0/3 9 Part 1 of 3 5 3 No. of goals, y 10 16 20 23 28 21 11 12 No. of wins, x 11 7 13 5 7 No. of goals, y 20 11 10 20 29 12 17 (a) Find the equation of regression line and draw the line on the scatter plot, but only if r is significant. Round the slope and y-intercept to four decimal places, if necessary. r (Choose one) significant at the 5% level. X

Identify the variables - Students who spend more time playing video games and working each week will have a lower GPA. 3. State the two quasi-independents variable and the one dependent variable (make sure to label each as QIV or DV)

The head of the marketing division of a leading chocolate manufacturer must decide among our different wrapper styles for the chocolate. To provide a database for the decision, he has the chocolate placed in the different wrappers and distributes them to five supermarkets. At the end of 2 weeks, he finds that the following amounts of chocolate were sold: Wrapper A  Wrapper B  Wrapper C Wrapper D  90 98 130 82 State the dependent and independent variable  Is this directional or non directional test