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The general form of a regression equation is [tex]\( Y = a + bX \)[/tex]. In this equation, [tex]\( Y \)[/tex] is the score we wish to predict and [tex]\( X \)[/tex] is the known score. What is [tex]\( a \)[/tex]?

A. It is a constant.
B. It is a weighting adjustment factor that is multiplied by [tex]\( X \)[/tex].
C. It is the slope of the line created with this equation.
D. It is the difference between [tex]\( X \)[/tex] and [tex]\( Y \)[/tex].

Sagot :

GinnyAnswer
Let's carefully examine the role of each component in the regression equation [tex]\( Y = a + bX \)[/tex].

1. Definition of Terms:
- [tex]\( Y \)[/tex]: This is the dependent variable or the score we are trying to predict.
- [tex]\( X \)[/tex]: This is the independent variable or the known score that we use to make predictions.
- [tex]\( a \)[/tex]: This is the y-intercept of the regression line.
- [tex]\( b \)[/tex]: This is the slope of the regression line.

2. Role of [tex]\( a \)[/tex]:
- The y-intercept ([tex]\( a \)[/tex]), also known as the constant term, is the value of [tex]\( Y \)[/tex] when [tex]\( X \)[/tex] is 0.
- This means that [tex]\( a \)[/tex] is the starting point or initial value of [tex]\( Y \)[/tex] in the absence of [tex]\( X \)[/tex].
- It doesn't change with [tex]\( X \)[/tex]; rather, it is added consistently across all values of [tex]\( X \)[/tex].

Based on these explanations, let's consider the possible options:
1. It is a constant.
2. It is a weighting adjustment factor that is multiplied by [tex]\( X \)[/tex].
3. It is the slope of the line created with this equation.
4. It is the difference between [tex]\( X \)[/tex] and [tex]\( Y \)[/tex].

Given our understanding, the correct answer is:

It is a constant.

This means [tex]\( a \)[/tex] does not change with the values of [tex]\( X \)[/tex] but remains a fixed value in the equation to adjust the vertical position of the regression line.
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