Virtual Labs

a: To create a relationship between two variables. b: To quantify the strength and direction of a relationship between two variables. c: To find the average of two variables. d: To determine the difference between two variables.

What does a correlation coefficient of -1 indicate?

a: A perfect positive correlation. b: No correlation. c: A perfect negative correlation. d: A weak positive correlation.

If the correlation coefficient between two variables is 0.75, how would you describe the relationship?

a: A strong negative correlation. b: A moderate positive correlation. c: A strong positive correlation. d: No correlation.

Which mathematical formula is used to calculate the Pearson correlation coefficient (r)?

a: r = (nΣxy - ΣxΣy) / sqrt[(nΣx^2 - (Σx)^2)(nΣy^2 - (Σy)^2)] b: r = 1 - (6Σd^2) / [n(n^2 - 1)] c: r = Σ(x - μx)(y - μy) / sqrt[Σ(x - μx)^2 * Σ(y - μy)^2] d: r = Σxy / sqrt[(Σx^2)(Σy^2)]

What does a correlation coefficient of 0 indicate?

a: A perfect positive correlation. b: No correlation. c: A perfect negative correlation. d: A weak positive correlation.

Community Links Sakshat Portal Outreach Portal FAQ: Virtual Labs

AGPL 3.0 & Creative Commons (CC BY-NC-SA 4.0)