STATISTICAL TECHNIQUES AND TOOLS
REGRESSION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The predicted weight of the rat in year 0.
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The predicted weight of the rat at birth.
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The current weight of the rat.
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The average increase in the rat’s weight.
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Detailed explanation-1: -Data was collected on the weight of a male laboratory rat for the first 25 weeks after its birth. The linear regression equation is y= 40x+100, where x is number of weeks and y is weight in grams. What does the y-intercept mean in the context of the problem? The predicted weight of the rat at birth.
Detailed explanation-2: -Q. Which is the best description of the y-intercept for the linear regression equation of the rats: Weight = 100 + 40(Time)? The y-intercept is 100, which means the rat is predicted to weigh 100 grams at birth. The y-intercept is 100, which is where the graph crosses the y-axis.
Detailed explanation-3: -The formula for simple linear regression is Y = mX + b, where Y is the response (dependent) variable, X is the predictor (independent) variable, m is the estimated slope, and b is the estimated intercept.