STAAR Review: Bivariate Data TEKS 8.5C/D & 8.11A

STAAR Review: Bivariate Data

I can...

8.5C - Identify sets of bivariate data that do/do not suggest a linear relationship.
8.5D - Use a trend line that approximates the linear relationship between bivariate sets of data.
8.11A - Observe and describe data identifying associations with bivarate sets of data.

Generally speaking, as x increases, y also increases. It's as if the data would follow a linear function with a positive slope.

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Positive Linear Association

Generally speaking, as x increases, y decreases. It's as if the data would follow a linear function with a negative slope.

Negative Linear Association

There is a pattern, but it would not follow a slope of a linear function.

Non-Linear Association

There is no pattern, showing there is not a relationship between the x and y values.

No Association

A line that can be added to a LINEAR association set of data to show the general pattern in which the data seem to be going.
It splits the data roughly in half is representative of most of the data points and is used to make predictions.

Trend Lines & Predictions

Use the next slides and your review packet to answer and keep track of your answers to the activities.

Multiple Choice

Determine if the statement is a reasonable prediction for Account A, Account B, both, or neither account.
Based upon the scatterplot, the account balance at three weeks is predicted to be $36.

• Account A

• Account B

• Both

• Neither

Multiple Choice

Determine if the statement is a reasonable prediction for Account A, Account B, both, or neither account.
Based upon the scatterplot, the account balance at 24 weeks is predicted to be approximately $10.

• Account A

• Account B

• Both

• Neither

Multiple Choice

Determine if the statement is a reasonable prediction for Account A, Account B, both, or neither account.
Based on the scatterplot, the account balance is predicted to be approximately $40 at week 20.

• Account A

• Account B

• Both

• Neither

Multiple Choice

Determine if the statement is a reasonable prediction for Account A, Account B, both, or neither account.
Based on the scatterplot, the initial account balance is predicted to have been approximately $40.

• Account A

• Account B

• Both

• Neither

Multiple Choice

Determine if the statement is a reasonable prediction for Account A, Account B, both, or neither account.
Based on the scatterplot, the account balance is predicted to have been approximately $104 at week 12.

• Account A

• Account B

• Both

• Neither

Draw

A science class recorded the weight of different numbers of rocks. Their results are shown in the scatter plot.

a. Sketch a trend line for the data and use it to answer the following questions on the next 2 slides.

Question 1: What is a reasonable prediction of the weight of 30 rocks?

Question 2: What is a reasonable prediction of the weight of 10 rocks?

Open Ended

Question 1: What is a reasonable prediction of the weight of 30 rocks?

Open Ended

Question 2: What is a reasonable prediction of the weight of 10 rocks?

Draw

Nelda is recording the amount of money she has in her savings account at the end of each month. She shows the results in the scatterplot.

a. Sketch a trend line for the data and use it to answer the following questions on the next 2 slides.

Question 1: What is a reasonable prediction of the amount of money in her savings account after 9 months?

Question 2: What is a reasonable prediction of the amount of money in her savings account after 11 months?

Open Ended

Question 1: What is a reasonable prediction of the amount of money in her savings account after 9 months?

Open Ended

Question 2: What is a reasonable prediction of the amount of money in her savings account after 11 months?

Use this time to complete the last page in your review packet.
Read the directions!
Turn it in when done!