Let's say that in some study, the original slope for the effect of weight on 60 second heart rate is a 1.615 bpm decrease in heart rate per 1 unit increase in weight (kg). This slope of 1.615 is our best estimate of the effect size (can be called the main effect or effect estimate), but as statisticians we know that it might be a little higher or lower. The standard error of this effect was 0.046 bpm/kg , which we can use to calculate a confidence interval around the main effect (a 95% CI ranges from 2 standard errors above the estimate to 2 standard errors below the estimate). After controlling for age, the new estimate of the main effect was 1.31. Was age a confounder

answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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rauschg

rauschg · hand

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step-by-step explanation:

no its the same as every other grade

step-by-step explanation:

step-by-step explanation:

let pq = qr = rs = x, and xz = y and zu = z.

if the horizontal lines are parallel, then corresponding segments are in proportion:

substitute:

therefore 3 = y = z.

xu = y + z → xu = 3 + 3 = 6