A variable that is related to either the response variable o

A variable that is related to either the response variable or the predictor variable or both, but which is excluded from the analysis is a

A) random variable
B) lurking variable
C) qualitative variable
D) discrete variable
E) none of these

A traffic officer is compiling information about the relationship between the hour or the day and the speed over the limit at which the motorist is ticketed. He computes a correlation coefficient of 0.12. What does this tell the officer?

A) There is insufficient evidence to make conclusions about the relationship between the variables.
B) There is a moderate positive correlation.
C) There is a moderate negative correlation.
D) There is a weak positive correlation.
E) None of these

Solution

1. Lurking variable, this variable is assumed to remain constant and is not included in the analysis.

2. Very weak positive correlation. Actually we can not say much since we do not know confidence level and sample size, but the value of 0.12 is very small.