The Promoter – Do NowWhat is an observation? What is an

inference?

What are the steps of the scientific method?

Create a hypothesis for the video we watched yesterday on preservatives and soup

Complete the graphic organizer on scientific method steps

The Scientific MethodAugust 29th, 2012

Happy Birthday to you, Kyle!

Scientific Method Steps1. Ask a question2. Do background research3. Construct a hypothesis4. Test your hypothesis Experiment5. Analyze your data6. Draw a conclusion!

Review!Independent Variable – the variable that is

manipulated or changed. The variable that is NOT affected by the other

Dependent variable –the variable whose value depends on another. The value that is measured in an experiment

Identify the variablesThe length of your hair and the days since

your last hair cut

Identify the variablesTime spent studying for a biology test and

your test score

The more you study for a test, the higher your test score

Independent variable on which axis?

Dependent variable on which axis?

Uphill or downhill graphed lined?Time spent exercising and weight loss

X axis?

Y axis?

Experimental & Control GroupExperimental Group - Used to compare with

the control group, and vice versa. The experimental group is the group that we apply the independent variable to!

Control group – group used as the normal comparison in an experiment. Identical to the experimental group in characteristics, size, gender, age, etc.

Example 1Ms. Kuipers plants roses in 3 different pots.

She wants to know which fertilizer is the best. The plant on the left gets fertilizer A. The plant on the right gets fertilizer B. The roses in the middle get plain soil.

Experimental group?

Control group?

Example 2Trey Songz is testing which of gasoline is going to

make his tour bus move the fastest between cities. He will use the same tour bus and measure the miles that a tank of diesel gas, premium gas, and regular gas.

Experimental Group:

Control Group:

Let’s identify the variableshttp://www.youtube.com/watch?v=

kLuaVuPtgG4

The question this lab is answering –

Independent variable -

Dependent variable –

Is there a control group?

All together! Example 4 A group of high school students were given a short course

in speed-reading. The instructor was curious if a monetary incentive would influence performance on a reading test taken at the end of the course.  Half the students were offered $5 for obtaining a certain level of performance on the test, the other half were not offered money. 

 Independent variable: Dependent variable: Experimental group: Control group: 

Example 5A social psychologist thinks that people are more likely to

conform to a large crowd than to a single person.  To test this hypothesis, the social psychologist had either one person or five persons stand on a busy walking path on campus and look up.  The psychologist stood nearby and counted the number of people passing by who also looked up. 

Independent variable: Dependent variable: Experimental group: Control group:

How do these relate to the hypothesis?If…then…because

If I implement the INDEPENDENT VARIABLE then it will cause __________ to happen to the DEPENDENT VARIABLE because of the background research I conducted!

A group of high school students were given a short course in speed-reading. The instructor was curious if a monetary incentive would influence performance on a reading test taken at the end of the course.  Half the students were offered $5 for obtaining a certain level of performance on the test, the other half were not offered money. 

If _______________ then _____________________

Foldable! Here’s the problem: High school seniors are

dropping out of school before graduation.

In your foldable: problem, information, hypothesis, experiment, data, conclusions

Word, definition, apply it to the problem!

InformationWhat information do we need to gather in

order to solve this problem?

Hypothesis StatementIf…then…because

What could help to lower the high school drop out rate?

ExperimentHow can we design this experiment?

What are we changing? Independent variableWhat are we measuring? Dependent variableShould we include a control group? Who?

DataWhat specific type of data should we collect?

Independent Practice