Answer two questions about Equations A and B: A. 5x=3x B. 5=3 1) How can we get Equation B from Equation A? (Choice A) Add/subtract the same quantity to/from both sides (Choice B) Add/subtract a quantity to/from only one side (Choice C) Multiply/divide both sides by the same non-zero constant (Choice D) Multiply/divide both sides by the same variable expression 2) Based on the previous answer, are the equations equivalent? In other words, do they have the same solution? (Choice A) A Yes (Choice B) B

The investigating team suspected that there were differences in the cost of repairing cars in workshop i and workshop ii. the investigating team suspected that the costs raised by workshop i were greater than workshop ii. for that they tested the repair of 15 cars in each workshop to see the cost of repairs.the decision of the right hypothesis to prove the suspicion above is a. h0 : μ1- μ2­ = 0; ha : μ1- μ2­ ≠ 0 b. h0 : μ1- μ2 ≥ 0; ha : μ1- μ2 < 0 c. h0 : μd ≥ 0; ha : μd < 0 with μd = μ2- μ1 d. h0 : μd = 0; ha : μd ≠ 0 with μd = μ2- μ1 e. h0 : μ1- μ2 = 0; ha : μ1- μ2 ≥ 0