Question

Section 2: True or False

Please indicate whether the following statements are True, False, or Undetermined.

Statement	True	False	Undetermined
Two variables that are highly correlated are causally related.
Observed points closest to the regression line are given more weight than points far away (i.e., outliers).
The standard deviation is only useful as a measure of dispersion for normally distributed variables.
Two variables that have no observed correlation cannot be causally related.
When a survey sample has a potential bias (e.g., an opt-in sample hosted on a politically slanted website) that bias does not get smaller as the sample size increases.
A regression model with a R-square value closer to zero than 1 means the model explains a majority of the variance in the dependent variable

Answer 1

1. Two variables that are highly correlated are causally related: Undetermined.

2. Observed points closest to the regression line are given more weight than points far away (i.e., outliers). False.

3. The standard deviation is only useful as a measure of dispersion for normally distributed variables. False.

4. Two variables that have no observed correlation cannot be causally related. True.

Please post the other questions separately as we are supposed to answer just one question or four subparts of a question.