Date: September 11, 2015

Aim #5: What do scientists do during experiments?

HW:1) HW #2-Textbook Guided Reading

Worksheet due Wednesday 9/162) Quiz - Scientific Method Thursday 9/17

Do Now: Warm-Up Notebook

Date Title of Activity Page #9/11 Experimental Design12

What do scientists do during experiments?

They collect Data

Data Collection

Data generally refers to the results of trials, or tests, completed during experiments.

Gender Accept Praise Remediate/Probe Criticize

M F

M F

M F

M F

A data table is an important initial stage in making sense of the information you will collect while doing an experiment.

How can we organize this information?

• A data table makes organizing data easier to read and study

Data Tables

Independent Dependent

The independent variable ALWAYS is written in the LEFT column and the DEPENDENT

variable in the RIGHT.

Procedure:

1) Half the students will measure their heart rate for 1 minuteduring rest and write it on a piece of paper.

2) Half the students will be instructed to complete 30 Jumping Jacks.

3) Those students who completed the Jumping Jacks will measure their heart rate for one minute and write it on a piece of paper.

Our Results:

Students

at rest

HR

1

2

3

Students after 30 JJ

HR

1

2

3

Group A Group B

AVG= AVG=

Let’s Graph!!!

Why do scientists utilize graphs?

A carefully constructed graph can provide us with a large amount of information quickly.

It also allows us to carefully analyze our results from an experiment.

Types of Graphs:Line Graph

What is this graph telling us?

Types of Graphs:

Pie Graph

What is this graph telling us?

Types of Graphs:Bar Graph or Histogram

What is this graph telling us?

Let’s Graph the Results from our Experiment:Y

axi

s

X Axis

We will be making a bar graph from our results.

We will graph the average heart rate for the control group and the experimental group.

Rules for Constructing Graphs:

Rule 1: The dependent variable is plotted on the vertical, Y-Axis.

Rule 2: The Independent Variable is plotted on the horizontal, X-Axis.

Rule 3: The spacing between the numbers on both axes must be in equal increments.

Our Graph:Y

XIndependent Variable

(Number of Jumping Jacks)

Dep

ende

nt V

aria

ble

(Bea

ts p

er m

inut

e) Control Group

ExperimentalGroup

LegendThe Effects of Exercise on Heart Rate

What are our results?

Our results indicate that heart rate increased after the students performed 30 jumping jacks.

What is our conclusion?

Was the hypothesis supported or rejected?

This experiment supported our hypothesis. Physical exercise (Jumping Jacks) increases a person’s heart rate.

Date: September 16, 2015

Aim #5 (cont’d): What do scientists do during experiments?

HW:1) Practice Questions (answer key will be

posted on webpage this afternoon)2) Quiz - Scientific Method Thursday 9/17

(periods 1 & 7), Friday 9/18 (period 5)

Do Now: Warm-Up Notebook

Date Title of Activity Page #9/16 Interpreting the Data13

Technique for Constructing a Line Graph

1. Identify the variables to be plotted•Independent variable

– the variable manipulated by the experimenter– is plotted on the x-axis (horizontal axis)

•Dependent variable– the factor responding to changes in the independent variable– plotted on the y-axis (vertical axis)

2. Determine the scale of the axes•Determine each axis individually

– May easily be determined by taking the largest value to be plotted and dividing by the number of blocks and then rounding up to the nearest convenient number

– The graph should be spread to occupy the most available space.3. Number and label each axis indicating the appropriate units.4. Plot each data value on the graph with a point.5. Draw a line that best fits the data points.

– Do not connect data points to the origin unless there is data to support this– Only connect the points if the directions tell you to do so.

6. Provide a title which clearly indicates what the graph is about.– If the graph has more than one set of data, provide a key to indicate what is

represented by the different lines.