Based on your scatter diagram, is there a relationship between the variables? If yes, describe the...

Based on your scatter diagram, is there a relationship between the variables? If yes, describe the relationship.
-Does it appear to be positive or negative? Strong or weak or moderate?
-What would your guess of r, the correlation coefficient, be?

Solutions

Expert Solution

We will describe the relationship from scatter diagram and its direction.

For example:

1. Bring data in to excel sheet

2.Select both x and y variable and insert scatter plot chart. Select any data point in the excel and add trend line.

Does it appear to be positive or negative? Strong or weak or moderate?

It appears to be a positive and it looks like Strong positive

Values between 0 and 0.3 (0 and -0.3) indicate a weak positive (negative) linear relationship
Values between 0.3 and 0.7 (-0.3 and -0.7) indicate a moderate positive (negative) linear relationship
Values between 0.7 and 1.0 (-0.7 and -1.0) indicate a strong positive (negative) linear relationship

What would your guess of r, the correlation coefficient, be?

we can use "=CORREL(Array 1, Array 2) " formula in excel to find the r value

correlation coefficeint r = 0.70. as we mentioned the strength from 0.70 to 1.00 is strong positive correlation

orchestra answered 2 years ago

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