2.1: Linear combinations. qy7 Jump to level 1 V1 = 7 -6 3 V2 = 1 5 a₁ V₁ + a₂ V₂ + a3 V3 = -7 Ex: 42 V3 ŵ = 9 5 Given a₁ = -4, a2 = 5, and a3 = 3, what vector is formed by the linear combination a₁ V₁ + a₂ V₂ + a3 V3? - -6
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Linear combinations.
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- Express w as a linear combination of u and v: ? = (4,1), ? = (−2, −1), ? = (2, −2)If there are no vectors in the set S = {a1; a2; a3} from R^3 who is a multipleof one of the other vectors. Is the set S linearly independent or linearly dependent?2. Determine the exact distance between the two skew lines r1 = (3, 4, – 2) + s (1, – 1, 2), seR and r2 = (1, – 5, 3) + t (2, 3, 1), teR. using grade 12 knowloge no matrix
- 8. Which of the following vectors is a linear combination v1 v2 and v3?For what value of m, the vector (m,3,1) a linear combination of e\index{1}=(3,2,1) and e\index{2}=(2,1,0) ?1. Determine, by inspection, whether the following sets of vectors aredependent or independent:i. U1 = (1, 2, 3) U2 = (-1, -2, -3) U3 = (10, 20, 30)ii. U1 = (1, 2, 3) U2 = (-1, 2, -3) U3 = (10, 0, 30)iii. U1 = (0, 0, 3) U2 = (-1, 0, 0) U3 = (0, 20, 0)iv. U1 = (1, 2, 0) U2 = (0, -2, -3) U3 = (10, 0, 30)v. U1 = (0, 0, 0) U2 = (-1, -2, -3) U3 = (20, 30, 10)
- Consider the linear model Yi = B0 + B1X1i + B2X2i + ui where ui is the error term and where E(ui|X1i,X2i) = 0, observations (Yi,X1i,X2i) are independent and identically distributed, 0 < E(Y4) < 1, 0 < 1i E(X14i) < 1, 0 < E(X24i) < 1 and where X2i = X12i. Are the OLS estimators Bˆ1 and Bˆ2 of the coe¢cients B1 and B2 unbiased and consistent? Explain.Determine whether the set of vectors in P2 is linearly independent or linearly dependent.S = {7 − 4x + 4x2, 6 + 2x − 3x2, 20 − 6x + 5x2}5) Find the initial point of the vector that is equivalent to u = (1, 1, 3) and whose terminal point is B(−1, −1, 2).
- If A is m by n, how many separate multiplications are involved when(a) A multiplies a vector x with n components?(b) A multiplies an n by p matrix B?( c) A multiplies itself to produce A2 ? Here m = n.S is a linearly independent set,then for any x element of , x is not the linear combination of other vectors in S. Is this true or false?Section 11.2 Question #9 In soccer, serious fouls result in a penalty kick with one kicker and one defending goalkeeper. The accompanying table summarizes results from 278 kicks during games among top teams. In the table, jump direction indicates which way the goalkeeper jumped, where the kick direction is from the perspective of the goalkeeper. Use a 0.05 significance level to test the claim that the direction of the kick is independent of the direction of the goalkeeper jump. Do the results support the theory that because the kicks are so fast, goalkeepers have no time to react, so the directions of their jumps are independent of the directions of the kicks? View the penalty kick data. Pentalty kick data Dialog content starts Goalkeeper Jump Left Center Right Kick to Left 54 0 36 Kick to Center 41 10 28 Kick to Right 41 6 62 Determine the test statistic. χ2=____________(Round to three…