I need help with this question.
Which of the following are needed to calculate a regression equation if all are given to you? Mark all that apply.
Question options:
1. standard deviation of the predictor (x)
2. correlation coefficient (r)
3. standard deviation of the outcome (y)
4. z-score of the outcome (y)
5. mean of the predictor (x)
6. z-score of the predictor (x)
7. mean of the outcome (y)
Which of the following are needed to calculate a regression equation if all are given to you? Mark all that apply.
Question options:
1. standard deviation of the predictor (x)
2. correlation coefficient (r)
3. standard deviation of the outcome (y)
4. z-score of the outcome (y)
5. mean of the predictor (x)
6. z-score of the predictor (x)
7. mean of the outcome (y)
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The regression equation is : y = bx + a
b is the slope = r Sy/Sx ( r, standard deviation of x , standard deviation of y)
a= mean of outcome y - b x mean of outcome x
You do not need
4. z-score of the outcome (y)
6. z-score of the predictor (x)
You need all of the others.
b is the slope = r Sy/Sx ( r, standard deviation of x , standard deviation of y)
a= mean of outcome y - b x mean of outcome x
You do not need
4. z-score of the outcome (y)
6. z-score of the predictor (x)
You need all of the others.