Monday August 24, 2009

Essential Question How are relationships between components on a scatter-plot graph determined? What is a “line of best fit” or a “trend line”? SC-H-MF-U-2 Students will understand that the usefulness of a model can be tested by comparing its predictions to actual observations in the real world. But a close match does not necessarily mean that the model is the only “true” model or the only one that would work.

Homework 1. Vocabulary List A is DUE 2.Writing Assignment: Tomatoes is DUE 3.Vocabulary List B will be due on Monday, 31 August. Tomorrow there will also be a short quiz.

Vocabulary Quiz A 1. In space for name, be sure and put both your first and last names 2. Record your answer in the space provided left of the number 3. Turn your paper face down when finished

Review 1.Scientific Method 2.Experimental Design 3.Tables and Graphs

Regression Relationships are mathematical descriptions of the comparability of data. On graphs there are four basic types. The shape or appearance of the data gives hints as to the algebraic formula needed to model the data.

Four types of relationships Direct ProportionIndirect Proportion Direct VarianceIndirect Variance

Circle Lab relationship The circle lab data indicates that circumference and diameter are a direct proportion…therefore a linear function model C D Using a straight edge, draw a line through the points Use the line to make the regression equation

Linear function is y = mx + b Start by finding the slope, m m = y 2 – y 1 / x 2 – x 1 C D y2y2 y1y1 x2x2 x1x1 What was your slope? Replace the y and x with the units on each axis