8007 exam

You are investigating the relationship between weather and stock market performance. To do this, you pick 100 stock market locations all over the world. For each location, you collect yesterday's mean temperature and humidity and yesterday's local index return. Performing a regression analysis on this data is an example of…A...

You are given the following values of a quadratic function f(x): f(0)=0, f(1)=-2, f(2)=-5. On the basis of these data, the derivative f'(0) is …A . in the interval ]-2.5,-2[B . equal to -2C . in the interval ]-2,+[D . in the interval ]-,-2.5]View AnswerAnswer: C

You are given the following regressions of the first difference of the log of a commodity price on the lagged price and of the first difference of the log return on the lagged log return. Each regression is based on 100 data points and figures in square brackets denote the...

What is the total derivative of the function f(x,y) = ln(x+y), where ln() denotes the natural logarithmic function?A . 1 / (x+y)B . (x + y) / (x+y)C . -x/(x+y) - y/(x+y)D . ln(x+y) x + ln(x+y) yView AnswerAnswer: B

Calculate the determinant of the following matrix:A . 4.25B . -4.25C . 4D . 2View AnswerAnswer: D

What is the angle between the following two three dimensional vectors: a=(1,2,3), b=(-4,2,0)?A . 90 degreesB . 180 degreesC . 57 degreesD . 45 degreesView AnswerAnswer: A

The determinant of a matrix X is equal 2 . Which of the following statements is true?A . det(2X) =B . det(2X) = 2 det(X)C . det(2X) = det(X)2D . det(2X) = 4 det(X)View AnswerAnswer: D

In which two ways can data be transferred between playbooks and sub-playbooks? (Choose two.)A . Inputs and outputsB . Through integration contextC . Automatically extracted by sub-playbooksD . From context data, if context is shared globallyView AnswerAnswer: A,D

Solve the simultaneous linear equations: x + 2y - 2 = 0 and y - 3x = 8A . x = 1, y = 0.5B . x = -2, y = 2C . x = 2, y = 0D . None of the aboveView AnswerAnswer: B