Statistics of Two Variables

TRIVIA Statistics of Two Variables

Question: • Variables have a ______ ______ if changes in one variable tend to be proportional to changes in the other.

Question: • Interpret the following “r” values and state their correlation.1. 0.75 2. -0.46 3. 0.15

Question: • ______ is an analytic technique for determining the relationship between a dependent variable and an independent variable.

Question: • The _____ __ _____, r², is a number which describes how closely the points follow the curve of best fit (COBF)

Question: • Use a graphing calculator to find the equation and coefficient of determination “r²” for a curve of best fit.

Question: • A change in X produces a change in Y.What kind of a relation is this?

Question: • The dependent and independent variables are reversed in the process of establishing causality.

Question: • A teacher is trying to determine whether a new spelling game enhances learning. In his gifted class, he finds a strong positive correlation between use of the game and spelling-test scores. Should the teacher recommend the use of the game in all English classes at his school?

Question: • You must be careful about accepting statistical results from sources that are biased or flawed, unintentionally or intentionally.Explain 3 things you would most likely critically examine.

Question: • The covariance divided by the product of the standard deviations for X and Y equals to…?

Statistics of Two Variables