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You are a state Commissioner of Education and want to evaluate the effect of a new instructional method. The new instructional method is implemented in 10 counties of the state (not selected randomly), but not in the other counties. You see that test scores in those 10 counties were decreasing in the three years prior to the instructional method being implemented, but were increasing in the remaining counties. This is an example where using differences-in-differences will produce good causal estimates of the effect of the instructional method. T/F

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Use the definition of the derivative to prove that, for any differentiable functions, $f$ & $g$, $(f \cdot g)'(a) = f'(a)g(a) + f(a)g'(a)$

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Rank the following benzoin acid derivatives in order of increasing acidity. 1 = least, 4 = most. 1 = least reactive, 4 = most reactive

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A study on the effects of seatbelts on children in car accidents was conducted. The test compared the number of children who were severly injured (requiring hospitiliation) while wearing a seatbelt versus not wearing a seatbelt. The test yieled the following hypotheses: \[ \begin{array}{l} H_{o}: p_{1}=p_{2} \\ H_{a}: p_{1}>p_{2} \end{array} \] Where $ p_{1} $ is the proportion of children severly injured that were not wearing seatbelts and $ p_{2} $ is the proportion of children severly injured that were wearing a seatbelt. The researchers looked at 300 children who were not wearing seatbelts and 55 of them were severly injured. They also looked at 128 children that were wearing seatbelts and 18 were severly injured. Using $ \alpha=0.05 $, complete the hypothesis test. Based on these samples, the test statistic is: $ \square $ and the $ p $-value is: $ \square $ (to 4 decimals) Based on this we: Select an answer Select an answer

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Write the number as a product of a real number and \textit{i}. Simplify all radical expressions.\newline$\sqrt{-17}$\newline$\sqrt{-17} = $\newline(Simplify your answer. Type your answer in the form $a + bi$. Type an exact answer, using radic

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The starship Enterprise locks onto an alien ship (whose mass is much greater than Enterprise's mass) with its tractor beam (think of this as a futuristic rope) and starts to pull the alien ship toward it. Neither ship has its propulsion engines running. Which ship has greater acceleration towards the other?

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Research that assesses a person's sense of self-efficacy is based on which theoretical model? Group of answer choices Activation Model of Information Exposure SENTAR Theory of Planned Behavior Socio-Cognitive Theory

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Assume x and y are functions of t. Evaluate dy/dt for the following. -3xy-9x^3+y^3=7; dx/dt =2, x=10, y=-1 Round your answer to two decimal places.

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In the primary source "The Mississippi Black Code" this was the offense that carried the most severe punishment. A white person having an inter-racial relationship Vagrancy A freedman failing to hold a job A freedman stealing from a white person

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What percentage of the general U.S. population have bachelor's degrees? The Statistical Abstract of the United States, 120th Edition, gives the percentage of bachelor's degrees by state. For convenience, the data are sorted in increasing order. 18,19,19,19,20,21,21,21,22,22,22,22,23,23,23,23,23,23,24,24,25,25,25,25,25,25,25,25,26, 27,27,27,27,27,27,28,28,28,28,28,29,29,30,32,32,33,33,35,36,39 (a) Compute the ar{x} and s of the data. ar{x} =. (Round your answer to 2 decimal places.) s=. (Round your answer to 2 decimal places.) (b) Find the data value, relative to the data set, corresponding to each of the following z-scores: z=0.45,x=,. (Round your answer to 2 decimal places.) z=-2.38,x=,. (Round your answer to 2 decimal places.) z=3.12,x=,. (Round your answer to 2 decimal places.) What percentage of the general U.S.population have bachelor's degrees? The Statistical Abstract of the United States, 120th Edition, gives the percentage of bachelor's degrees by state. For convenience, the data are sorted in increasing order. 27.27.27.27.27.27.28.28.28.28.28.29.29.30. 32.32.33.33.35.36.39 (a) Compute the and s of the data. (Round your answer to 2 decimal places.) (Round your answer to 2 decimal places.) (b) Find the data value, relative to the data set, corresponding to each of the following z-scores z=0.45, (Round your answer to 2 decimal places.) z= -2.38,= (Round your answer to 2 decimal places.) z=3.12,x= (Round your answer to 2 decimal places.)

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taylor s.