Today’s Agenda

CatalystLibrary Skills IV, DV, Constants, and ControlsExit Question

HW: Answer Chapter ReviewQuestions (pg 18-19) #s 3, 4,

10, 11, 12

Today’s Objectives

SWBAT learn crucial library skills with Ms. Aymami’s little freshman Honors kids.

SWBAT distinguish between independent and dependent variables.

SWBAT to understand the role of a control group in an experiment.

POP QUIZ!!!!

Please take out a piece of paper.

Write your name on it.Title it “Pop Quiz #1.”

Pop Quiz – Just write the answers.1. In at least one complete sentence,

describe one difference between qualitative observation and quantitative observation.

2. In at least one complete sentence, describe one of the following: law or theory.

Experimentation

Key Point #1: A proper experiment always has an independent variable and dependent variable. The purpose of an experiment is to test how changing ONE THING affects something else.

Variables

Independent Variable: what causes the change we are measuring (acts independently)

Dependent variable: what gets changed (depends on other things)

Remember!!!! Variables are always CATEGORIES of

things: time, amount, frequency, size, type Variables are NEVER specific things!!!

Demo

http://www.unitedstreaming.com/videos/dsc/externalApplications/virtual_labs-es/Plants/index.html

Teacher Models

Scientists have discovered something shocking: if you eat a lot of hamburgers, then you will gain fat. What is the independent variable?A. Eat a lot of hamburgersB. Type of hamburger you eat (McDonald’s,

Wendy’s, Burger King, etc.)C. Amount of hamburgers you eatD. How much weight you gain

Teacher Models

Well-rested students learn more in school. So, Ms. Stroh believes that starting school later would increase test scores. What is the dependent variable?A. Starting school laterB. Well-rested studentsC. Time that school startsD. Test scores

Whiteboards 1

Ms. Stroh believes that the more you study, the better grades you’ll earn. What is the independent variable?A. Studying moreB. Amount of time you studyC. Grade earnedD. Type of test

Whiteboards 2

Shanel is always cold in class. She hypothesizes that if she wears many layers of clothing to school, then she will be warmer. What is the dependent variable?A. Number of layers Shanel wearsB. How warm Shanel isC. Temperature of the roomD. Shanel will be warmer

Whiteboards 3

Ms. Stroh’s students want to test how easily bought off she is. Students who give her an apple get a “C.” Students who give her candy get an “A.” What is the independent variable?A. Type of food given to Ms. StrohB. Apples and candyC. “A” on the report cardD. Report card

Whiteboards 4

Tashica hates cooking, but loves listening to music. She believes that if she listens to music while cooking, then she will cook more often. What is the dependent variable?A. She will cook more oftenB. Listens to music while cookingC. Frequency that Tashica cooksD. What Tashica listens to

If you’re having trouble…

4 minutes 26 mg of baking

soda Lifting weights

every day Medium t-shirts Bullfrog 16 candles Never gets sick

Time to get dressed Amount of baking

soda Frequency of lifting

weights Size of t-shirts Type of frog Number of candles Degree of health

WRONG RIGHT

Review

Ms. Stroh believes that the more you study, the better grades you’ll earn. What is the independent variable?A. Studying moreB. Amount of time you studyC. Grade earnedD. Type of test

Review

Shanel is always cold in class. She hypothesizes that if she wears many layers of clothing to school, then she will be warmer. What is the dependent variable?A. Number of layers Shanel wearsB. How warm Shanel isC. Temperature of the roomD. Shanel will be warmer

Review

Ms. Stroh’s students want to test how easily bought off she is. Students who give her an apple get a “C.” Students who give her candy get an “A.” What is the independent variable?A. Type of food given to Ms. StrohB. Apples and candyC. “A” on the report cardD. Report card

Review

Tashica hates cooking, but loves listening to music. She believes that if she listens to music while cooking, then she will cook more often. What is the dependent variable?A. She will cook more oftenB. Listens to music while cookingC. Frequency that Tashica cooksD. What Tashica listens to

Constants

Key Point #2: Everything but the independent and dependent variable must be kept constant. Constant: variable we keep the same

If many different things change at once, we don’t know what causes the change!

Example

Let’s say we want to design an experiment to determine what causes the Hornets to win games.

Number of games that

Hornets win

Try this one! Answer in notes… Travie McCoy hypothesizes that if he

write more songs about being rich, then he will sell more CDs because his listeners also want to be rich. What is the IV? What is the DV? What are the constants?

Remember, variables are CATEGORIES.

If Travie write more songs about being rich, then he will sell more CDs because his listeners also want to be rich.

IV Number of songs about being rich How often Travie sings about being rich Amount of times Travie sings about money

DV Number of CDs Travie sells How many CDs Travie sells

Constant Amount of money CDs cost Number of tracks on each CD How good each CD is

Practice

You want to know when in the year there are the most love bugs. Every night, you record how many love bugs you find outside.

IV =

DV =

Constant =

Time of year (season/month)

Amount of fireflies

Practice

Maria needs to run a 6 minute mile to pass PE. She believes that if she runs every day, then she will be able to run faster.

IV =

DV =

Constant =

Frequency that Maria runs

Mile time

Practice

Students of different genders were given the same puzzle to assemble. The puzzle assembly time was measured.

IV =

DV =

Constant =

Type of gender

Time to assemble puzzle

If there are more students, then there

will be more school bus drivers.

IV =

DV =

Constant =

Amount of students

Number of school bus drivers

If the amount of sugar used on beignets decreases, then less beignets will be sold.

What depends on what?

IV =

DV =

Constant =

Amount of sugar usedNumber of beignets sold

IV = Number of games won

DV = Number of players attracted

Constant =

If the Saints win more games, then they will attract more big name players.

Conclusion

A proper experiment always has an independent variable and dependent variable. Everything but the independent and dependent variable must be kept constant. Independent Variable: what causes the

change we are measuring Dependent variable: what gets changed Constant: variable we keep the same

Exit Question

Let’s say you want to figure out if drinking milk actually makes you taller. So you drink a glass of milk every day, and record your height every day.

1. What is the independent variable?2. What is the dependent variable?3. What are at least two constants?

HW: Answer Chapter ReviewQuestions (pg 18-19) #s 3, 4, 10,

11, 12