The Scientific Method involves a series of steps that are used to solve a problem

1. Problem/Question2. Formulate a Hypothesis3. Test the Hypothesis (Experiment)

4. Collect Data and Analyze Results

5. Accept/Reject Hypothesis6. Conclusion or Revise Hypothesis

Steps of the Scientific Method

1. Problem/Question: Develop a question or problem that can be solved through experimentation. This should be specific, not have a “yes/no” answer.

Caution!When writing the problem/question, be careful how you use effect and

affect.

Effect is usually a noun, affect is usually a verb.

“ The effect of sugar amounts on the rising of bread.”

“How does sugar affect the rising of bread?”

Steps of the Scientific Method

2. Formulate a Hypothesis: A testable prediction of the answer to the problem or question.

A hypothesis is written as an if/then statement

If (insert your hypothesis), then…

Example: If soil temperatures affects plant growth, then as soil temperature increases, plant growth will increase.

Steps of the Scientific Method

3. Experiment: Develop and follow a procedure. Include a detailed materials list. The outcome must be measurable (quantifiable).

Steps of the Scientific Method

4. Collect Data and Analyze Results:

Organize the results of the experiment.

May be quantitative (numbers) or qualitative (descriptive)

Include tables, graphs, and photographs.

5. Accept/Reject Hypothesis:

Based on the analysis of the data.

Steps of the Scientific Method

6. Conclusion: The answer to the hypothesis based on the data obtained from the experiment.

Think you can name all six steps?

Flip over your notes…. You have one minute… GO!

Target 3: Create a hypothesis from a question using an if/then statement.Create an “if/then” statement for each question.

1. Will placing plants in sunlight make them grow taller?

Answer: If plants are put in sunlight, then they will grow taller.

2. Does eating carrots make your skin turn orange?Answer: If one eats carrots, then his/her skin will turn orange.orIf one eats carrots, then his/her skin will not turn orange

Target 4: Identify the independent and dependent variables when given a hypothesis, data table or graph.

VariablesTwo definitions:

A variable is something that is changed

A constant, or control, is something that does not change

Do you know the difference between the independent and dependent variables?

A. They are the same thingB. The independent variable changes, the dependent variable

stays the sameC.The independent variable changes, the dependent variable is

the variable being measuredD.The independent variable is the things that stay the same

during the experiment, the dependent variable is standard used for comparison

Science experiments use…Independent Variable: the one factor that

is changed by the person doing the experiment

Dependent Variable: the factor which is measured in the experiment

Constants: all the factors that stay the same in an experiment

A birdy example…Imagine you want to see what color of bird

feeders your local birds preferred.

Red? Blue? Green?

Identify the independent and dependent variables and the constants

Our Constants and VariablesIndependent Variable: color of the feeders

Dependent Variable: amount of seed eaten

Constants: everything else that is kept the same, for example:the location of the feedersthe kind of feeder usedputting the feeders out at the same time

Our Experimental DesignConstants Location of feeders

Kind of seedType of feeder

IndependentVariable Red Blue Green

DependentVariable

Amount of Seed Eaten

Amount of Seed Eaten

Amount of Seed Eaten

Scientific Method Gum Lab

Metric System (SI units)

Is a decimal system based on 10K H Da g, m, l d c mKids hate doing grammar during cold months

math, literature

Example:.001 kg .01 hg .1 dag 1g 10 dg 100 cg 1000 mg

Used throughout the scientific world

Used by scientists and hospitals

Units in the Metric System (SI units)

length meter m

volume liter L

mass gram g

temperature Celsius °C

Stating a Measurement

In every measurement there is

a

¨ Number

followed by a

¨ Unit from measuring device

Questions????

What is the SI unit of measurement in each of the following examples?

A. The patient’s temperature is 55°C.

B. The sack holds 5 decagrams of potatoes.

C. It is 8 kilometers from your house to

school.

D. The bottle holds 2 L of orange soda.

Solution

A. °C (degrees Celsius)

B. dag

C. kilometers

D. L (liters)

Learning Check Identify the measurement in SI units. A. John’s height is1) 1.5 yards 2) 6 feet 3) 2

meters

B. The volume of saline in the IV bottle is

1) 1 liters 2) 1 quart 3) 2 pints

C. The mass of a lemon is1) 12 ounces 2) 145 grams 3) 0.6

pounds

Solution A. John’s height is

3) 2 meters

B. The volume of saline in the IV bottle is

1) 1 liter

C. The mass of a lemon is2) 145 grams

OBSERVATION vs. INFERENCE

ObservationsThe ability to

notice significant

detailsGathered through

your sensesA scientist

notices something in their natural

world

Observations

An example of an observation might be noticing that

many salamanders near a pond have

curved, not straight, tails

ObservationRecord 5 observations about this science

classroom.1.2.3.4.5.

InferenceA conclusion reached

on the basis of evidence and reasoning.

An example, Salamanders have curved tails when exposed to certain chemicals.

List 3 inferences about this classroom1.

2.

3.

ExamplesObservations

That plant is extremely wilted.

The car stopped running

The Reds are leading their division

Inferences

That plant is extremely wilted due to a lack of water.

The car stooped running because it was out of gas.

The Reds are leading their division because they are playing well right now.

More examplesWhat observations

can we make about this picture?

What can we infer based on this picture?

Look at these two sets of animal tracks.

List 3 OBSERVATIONS

Make an INFERENCE

Now what do you think?

Make 3 OBSERVATIONS

Make an INFERENCE

Now what do you think?

Make 3 OBSERVATIONS

Make an INFERENCE

Target 5: Identify the control and experimental groups in an experiment.

Control Group In a scientific experiment, the control is the group that serves as the standard of comparison.The control group may be a “no treatment" or an “experimenter selected” group.

Control Group The control group is exposed to the same

conditions as the experimental group, except

for the variable being tested.

All experiments should have a control group.

Control Group Because his grandmother always used 50g of sugar in her recipe, John is going to

use that amount in his control group.

Write down 5 observations and 2 inferences based on the photo below.