Bell Work 1/21/15

Simplify the following fractions.

Yesterday’s Homework

1. Any questions?2. Please pass your homework to the front.

• Make sure the correct heading is on your paper.• Is your NAME on your paper?

• Make sure the homework is 100% complete.• Incomplete work will NOT be accepted.

Scatter Plots and Trend Lines

04/19/23

Heading

TSWBAT: interpret and analyze scatter plots.

Represent two numerical variables on a scatter plot and informally describe how the data points are distributed and any apparent relationship that exists between the two variables (e.g., between time spent on homework and grade level).

4.4

Notes

• Scatter Plot = a graph of points representing a collection of data.

• Correlation

= describes a relationship between two data sets.

• Definitions

• Extrapolation = a prediction outside the range of our data.

• Interpolation = a prediction within the range of our data.

Notesa. Positive Correlation

The graph has a pattern of __________ slope.

As variable x ____________, variable y ___________.

upward

increases increases

Notesb. Negative Correlation

The graph has a pattern of ____________ slope.

As variable x ____________, variable y ___________.

downward

increases decreases

Notesc. No Correlation

The graph has a pattern of _____ _____________.

As variable x ____________, variable y _____________________.

no correlation

increases can not be predicted

Notes

Look at the points (dots) on the graph, is there a

correlation (pattern/trend)?

As hours spent online ____________, number of emails sent

__________.

Ex1.

The graph has a pattern of __________ slope.

As variable x ____________, variable y ___________.

upward

increases increases

increases

increases Positive Correlation

Notes

As the temperature outside ____________, the hours spent

studying ___________.

Ex2.

The graph has a pattern of ____________ slope.

As variable x ____________, variable y ___________.

downward

increases decreases

increases

decreases Negative Correlation

Look at the points (dots) on the graph, is there a correlation

(pattern/trend)?

Notes

As the age of someone ____________, the number of books read

last year ____________________.

Ex3.

The graph has a pattern of ____ ____________.

As variable x ____________, variable y ____________________.

no

increases can not be predicted

increases

can not be predicted. No Correlation

Look at the points (dots) on the graph, is there a correlation

(pattern/trend)?

correlation

Summary

If a scatter plot has an upward slope it has a _______ correlation. If it is downward it has a negative __________. If it is not upward or downward it has ___ correlation.

positivecorrelation no

Today’s Homework

1. Pencil ONLY.2. Must show all of your work.• NO WORK = NO CREDIT

3. Must attempt EVERY problem.4. Always check your answers.

Rules for Homework

Homework 4.4Describe the correlation.1. 2. 3.

4. 5.

Complete the Ticket Out the Door without talking!!!!!

Talking = time after the bell!

Ticket Out the Door

Put your NAME on the paper.

When finished, turn your paper face DOWN.

Describe the correlation.