Study Hall (8:45 – 9:15) Sharpen all pencils, grab your notebook, ready to begin

Welcome to Science Class September 17 th ( A), 2014 September 18 th (B), 2014

Warm Up – Reading! Yes reading  You will read the following pages:  DIV 27 and DIV 28  Answer question 1 (page DIV 28)on your index card (cards are on cart)  You must answer in a complete sentence – this will be taken up in 5 minutes

2.0 The Sandwich – Cookie Challenge  You will now get your own graph paper you will see that there are 2 graphs on it (one on the front, one on the back)  We are recording data on the side labeled  Procedure = Different Pair Procedures  copy what you see on the board onto your own graph paper

2.0 The Sandwich – Cookie Challenge  Project the graph and record each pairs’ data

2.0 The Sandwich – Cookie Challenge  The data we just recorded is known as a Line Plot  Find the page in your notebook where you left off and write this word: Line Plot  copy the definition (page DIV 27)

The Sandwich – Cookie Challenge  Does everyone understand how we recorded our data on the line plot?  Example: 8 X’s above 24 = 8 students recorded 24 drops of water on their penny (8 trials resulted in that measurement)  Questions?

The Sandwich – Cookie Challenge  Why do you think each pair got different results?  Why do you think our class data was spread out over a large range?  It’s because we all used different procedures!

The Sandwich – Cookie Challenge  Write this in your notebook:  Distribution = spread  Our class data was spread out or distributed over a large number of water drops  This spread of data is referred to as distribution

The Sandwich – Cookie Challenge  Write this in your notebook:  Variation = wide spread of data  Every group used a different procedure

The Sandwich – Cookie Challenge  Do you think scientists have data that is spread out or distributed over a wide range  NO!  Their data would not be reliable or trustworthy and people would not believe their research

The Sandwich – Cookie Challenge  Let’s think about….  How did you squeeze your pipette?  How high was your pipette from the penny?  Was the penny on heads or tails?

The Sandwich – Cookie Challenge  What can we do to make our data more reliable or consistent?

Reading! Yes reading again  You will read the following page: DIV 29  Write these 2 vocabulary words down:  Repeatable:  Replicate:  Write the definition for each word (DIV 29)

Reading! Yes reading again  You will read the following page: DIV 30  Write these 3 vocabulary words and the definitions  Trial:  Precision:  Range:  Write the definition for each word (DIV 30)

The Sandwich – Cookie Challenge  We can create a classroom procedure  With 1 procedure, we can all follow the same steps  Do you think this will make our data more repeatable?  YES!!!!

Write this down: Data Table #2  Draw this table in your notebook  You will complete this table but everyone will follow the same classroom procedure Trial ## drops of water

Our Classroom Procedure…  1. Determine who will be recording data and who will be dropping water droplets  2. Place the penny heads side up  3. Fill the pipette up with water by squeezing the bulb, placing it in the cup of water and releasing the bulb slowly (this will allow water to fill inside the pipette)  4. Hold the full pipette 1 paper clip length above the penny  5. Squeeze the pipette gently so only 1 drop of water falls at a time  6. Count and record each water drop until the entire surface of the penny is full (this means water is near the edge of the penny but not over flowing)  7. Repeat these steps 6 times and record the data

Run the procedure again  You will now follow the CLASSROOM PROCEDURE with the same partner as before  Move to your pair now!  You have 10 minutes  You will record your data in your table  GO!

Follow this Procedure…  1. Determine who will be recording data and who will be dropping water droplets  2. Place the penny heads side up  3. Fill the pipette up with water by squeezing the bulb, placing it in the cup of water and releasing the bulb slowly (this will allow water to fill inside the pipette)  4. Hold the full pipette 1 paper clip length above the penny  5. Squeeze the pipette gently so only 1 drop of water falls at a time  6. Count and record each water drop until the entire surface of the penny is full (this means water is near the edge of the penny but not over flowing)  7. Repeat these steps 6 times and record the data

2.0 The Sandwich – Cookie Challenge  Again, you will receive 1 sticky note = write the # of drops your recorded for each trial  This means you should have 6 numbers recorded  When I call you up, bring your  Questions?

2.0 The Sandwich – Cookie Challenge  Project the graph and record each pairs’ data  Now record the data on the other graph labeled 1 Classroom Procedure

Cookie Challenge - Graphs  Label next blank page: Cookie Challenge – Graphs  Put your table into your notebook now – fold it in half and glue down only the side  See teacher example  Add this to your table of contents

What’s the point!  Was the data closer together after the 2 nd trial?  Why is this?  We used the same procedure!  Scientists must follow the exact steps or the same procedure so their results can be repeated by other scientists. This is the only way scientists can produce reliable, trustworthy data!

Did anyone notice….  During our first trial, half of you received a pipette that had been cut  By cutting some of the pipettes, the water drops were different sizes!  So again, scientists have to make sure they are all using the same materials and the same procedures to produce repeatable and reliable results.

Write this down… Scientists only trust results that can be repeated by other scientists! Scientists must use the same procedures to solve problems.