DAILY QUESTION September 2, For science class, you have asked 100 HHS students what their favorite lunch is: pizza, crispitos, hamburgers, or other. How would you present your data to the class; would you use a bar graph, pie chart, or a line graph? 2.For your answer to #1, why did you choose to present your data that way?

AGENDA9/2/08 Daily Question Newsletter  SI Unit Conversions  Presenting Data  Scientific Notation Assignment: 1. Finish Unit Conversion Wksht due 9/3 2. Scientific Notation Wksht due 9/3

SI Unit Prefixes GigaG10 9 1,000,000,000 MegaM10 6 1,000,000 Kilok10 3 1,000 Hectoh Dekada UNIT Decid Centic Millim Microµ Nanon

GMkh da U dcmµn King Henry Died Unexpectedly Drinking Cold Milk

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Presenting Scientific Data Line graphs are best for continuous change. Line graphs are usually made with the x-axis showing the independent variable and the y-axis showing the dependent variable. The values of the dependent variable depend on what happens in the experiment. The values of the independent variable are set before the experiment takes place. Section 3 Organizing Data Chapter 1

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Line Graph Section 3 Organizing Data Chapter 1

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Presenting Scientific Data, continued Bar graphs compare items. A bar graph is useful for comparing similar data for several individual items or events. A bar graph can make clearer how large or small the differences in individual values are. Section 3 Organizing Data Chapter 1

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Bar Graph Section 3 Organizing Data Chapter 1

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Presenting Scientific Data, continued Pie charts show parts of a whole. A pie chart is ideal for displaying data that are parts of a whole. Data in a pie chart is presented as a percent. Section 3 Organizing Data Chapter 1

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Writing Numbers in Scientific Notation Scientific notation is a method of expressing a quantity as a number multiplied by 10 to the appropriate power. Some powers of 10 and their decimal equivalents are shown below = = = = = = = Section 3 Organizing Data Chapter 1

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Writing Numbers in Scientific Notation, continued Using scientific notation When you use scientific notation in calculations, you follow the math rules for powers of 10. When you multiply two values in scientific notation, you add the powers of 10. When you divide, you subtract the powers of 10. Section 3 Organizing Data Chapter 1

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Math Skills Writing Scientific Notation The adult human heart pumps about L of blood each day. Write this value in scientific notation. 1. List the given and unknown values. Given: volume, V = L Unknown: volume, V = ? x 10 ? L Section 3 Organizing Data Chapter 1

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Math Skills, continued 2. Write the form for scientific notation. V = ? x 10 ? L 3. Insert the known values into the form, and solve. First find the largest power of 10 that will divide into the known value and leave one digit before the decimal point. You get 1.8 if you divide into L. So, L can be written as (1.8 x ) L Section 3 Organizing Data Chapter 1

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Math Skills, continued Then write as a power of 10. Because = 10 4, you can write L as 1.8 x 10 4 L. Section 3 Organizing Data Chapter 1 V = 1.8 x 10 4 L

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Math Skills Using Scientific Notation Your state plans to buy a rectangular tract of land measuring 5.36 x 10 3 m by 1.38 x 10 4 m to establish a nature preserve. What is the area of this tract in square meters? 1. List the given and unknown values. Given: length, l = 1.38 x 10 4 m width, w = 5.36 x 10 3 m Unknown: area, A = ? m 2 Section 3 Organizing Data Chapter 1

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Math Skills, continued 2. Write the equation for area. A = l  w 3. Insert the known values into the equation, and solve. A = (1.38  10 4 m) (5.36  10 3 m) Regroup the values and units as follows. A = (1.38  5.36) (10 4  10 3 ) (m  m) When multiplying, add the powers of 10. A = (1.38  5.35) ( ) (m  m) A =  10 7 m 2 A = 7.40  10 7 m 2 Section 3 Organizing Data Chapter 1