Question

As a project for a psychology course, a student correlated weight and intelligence scores for 250 students. the computed correlation coefficient was .00. what did the scatter plot look like? select one:

a. a random distribution of points
b. a line with a positive slope
c. a straight line from the lower left to the upper right-hand corner
d. a straight line from the upper left to the lower right-hand corner

Answer 1

x-y correlation or scatter plot are statistical tools that are used to describe the degree of relationship between the variables given. In an x-y correlation, there is a factor called coefficient of correlation which describes this relationship. The coefficient ranges from -1 to 1. A strong correlation with almost linear trendline from the scattered plot has a coefficient of equal to 1. Positive correlation entails positive slope while a negative correlation shows a downward slope 1. When r = 0, then the data forms random distribution in which no correlation is drawn. The closer r is to 1 or -1 and farther from 0, then the better the correlation.