In the following regression equation, y is a binary variable: 𝑦 = 𝛽 0 + 𝛽 1 𝑥 1 + . . . + 𝛽 𝑘 𝑥 𝑘 + 𝑢 Notice that 𝑃 ( 𝑦 = 1 | 𝑥 ) = 𝐸 ( 𝑦 | 𝑥 ) where 𝑃 ( 𝑋 ) stands for probability of event X occurring So, 𝑃 ( 𝑦 = 1 | 𝑥 ) = 𝛽 ^ 0 + 𝛽 ^ 𝑥 1 + . . . + 𝛽 ^ 𝑥 𝑘 In this case, the estimated slope coefficient  𝛽 1 ^  measures _____.  单项选择题

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In the following regression equation, y is a binary variable: y=β0+β1x1+...+βkxk+u Notice that P(y=1|x)=E(y|x) where P(X) stands for probability of event X occurring So, P(y=1|x)= ˆ β 0+ ˆ β x1+...+ ˆ β xk In this case, the estimated slope coefficient  ^ β1  measures _____.  

In the following regression equation, y is a binary variable: 𝑦 = 𝛽 0 + 𝛽 1 𝑥 1 + . . . + 𝛽 𝑘 𝑥 𝑘 + 𝑢 Notice that 𝑃 ( 𝑦 = 1 | 𝑥 ) = 𝐸 ( 𝑦 | 𝑥 ) where 𝑃 ( 𝑋 ) stands for probability of event X occurring So, 𝑃 ( 𝑦 = 1 | 𝑥 ) = 𝛽 ^ 0 + 𝛽 ^ 𝑥 1 + . . . + 𝛽 ^ 𝑥 𝑘 In this case, the estimated slope coefficient  𝛽 1 ^  measures _____.  

A 62.9 kg lady is standing on a weighing scale in an elevator as shown in the diagram below. Assume gravitational acceleration = 15 ms-2 Given that the elevator is accelerating upwards at 3.7 ms-2 , determine the magnitude of the normal force on the lady.

An object is fired from ground level at an angle of 31.9 degrees to the horizontal. Taking acceleration due to gravity = 7.65 ms-2 If the initial speed is 5.6 ms-1, how far from the starting point will it hit the ground? Assume air resistance is negligible.

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