Q:

Which of the following is NOT a requirement in determining whether there is a linear correlation between two​ variables?Choose the correct answer below.A.Any outliers must be removed if they are known to be errors.B.A scatterplot should visually show a​ straight-line pattern.C.The sample of paired data is a simple random sample of quantitative data.D.If rgreater than​1,then there is a positive linear correlation.

Accepted Solution

A:
Answer:Option d is rightStep-by-step explanation:We know that a linear correlation is a measure of association between two variables dependent and independent variable.  r always lies between -1 and 1 both inclusive.  If r is nearer to 0 weak correlation and if |r| is near to 1 there is a stronger correlation.Positive sign of r implies positive association and negative r implies negative association.Hence out of the four options given about correlation we haveOption a is right because removal of outliers confirm accurate correlationOption B is right because only if linear pattern is visible, correlation will be rightOption C is right because only for numerical data r can be calculatedOption d is wrong because correlation lies always between -1 and 1 both inclusive.