4.63 There is a negative linear relationship. The strength is unknown.
4.64 a. r
There is a moderately strong negative linear relationship.
b. R2 = r2 = ( .7813)2 = .6104
61.04% of the variation in y is explained
16.1 a The slope coefficient tells us that for additional inch of fathers height the sons height increases on average by .516. The yintercept is meaningless.
b On average the son will be shorter than his father.
c On average the son will be tal
Simple Linear Regression
4.4 Measures of Linear Relationship
There are three numerical measures of linear relationship that provide information as to the
strength & direction of a Linear Relationship between two variables (e.g. X & Y)
Descriptive statistics: deals with methods of organizing, summarizing, and presenting data in a
convenient and informative way.
Typical : measure of central location
range : measure of variability
Inferential statistics: is a body of methods used