Unit 8 Key Words/Info

Inference for slope key words

• “predict”

• “relationship”

• “associated with an increase or decrease”

• “estimate… change”

Inference for slope key info

• one sample being taken

• quantitative variables not categories

Inference for slope definition

convincing statistical evidence of a linear relationship between two quantitative variables

How do you define variable for inference for slope

“Let B represent the true slope of the linear relationship between ____ (explanatory variable) and ____ (response variable) for the population of ____.

Conditions for inference of slope

• Linear

• Independent

• Normal (Residuals)

• Equal Variance

• Random

Conditions - Linear

• relationship between x and y appears linear

• residual plot shows random scatter

Conditions - Normal

• residuals are approximately normally distributed OR

• sample size is large (n>=30)