Inquiry 9/8 and 9/9

Please take out your lab book and prepare for a

warm-up

Write your name on the popsicle stick you picked up

when you came in

Warm-Up 9/8 & 9/9• Is each question below testable by science?

Explain why or why not for EACH question

1.Which singer, Justin Bieber or Taylor Swift, causes fans to scream the loudest?

2.Which singer, Justin Bieber or Taylor Swift, causes fans to get the most excited?

New Seats!!!• Wait until I have read all of the names before

you move.

Learning Targets

• I can write a testable scientific question and explain why some questions are not testable.

• I can design a quality science experiment from start to finish.

The Scenario

• Health inspector visit next week.

• Visual tests as well as lab tests – to see if there are bacteria that cleaning missed.

• How can we help the school pass the visit?

Today’s AgendaDevelop testable question

Create materials list

Create procedure

Create data collection table

Collect the data!

Experimental design notesDefinitions you should know so far:

Valid = follows the conventions of the scientific method

Reliable = can be duplicated to achieve the same results

Manipulated variable = the variable you changed (temp of water, time of washing)

Responding variable = what you measured (the amount of “germs” on hands)

More definitions

Controlled variable = what was the same each time (person washing, tap water)

Constant/standard = the trial that you compare everything else to (hands that haven’t been washed yet)

Qualitative = observations/data that don’t involve numbers

Quantitative = numerical data

good testable questions

Good Questions:

• State both MV & RV.

• Relate how changing MV would affect RV.

• Ask in form of a question.

• Can be tested with a controlled experiment.

Bad Questions:

• Do not have variables.

• Are very vague.

• May not be in form of a question.

• Cannot be tested or are difficult to test with a controlled experiment

• Involve emotion or judgment.

What Testable Question Works?• Health inspector visit – next week.

• Will do visual tests as well as lab tests – to see if there are bacteria that cleaning missed.

• How can we help the school pass the visit?

• Based on this scenario, what (testable) questions could we ask that could be answered through a scientific experiment?

• Brainstorm with your table group for ONE min.

Where should you swab?• Brainstorm with your table group for TWO

minutes.

• Come up with a TOP 3.

• Must be able to get there during class, swab, and return within 10 minutes.

• Don’t have to be places, can be things…

Begin Lab Report• In the lab section, title it “Health Inspector Lab”

• Write the testable question from the white board

• Write a hypothesis (can use if, then, because, but don’t have to).

• Be prepared to share

Materials Provided

• (2) Q-Tips

• (1) Petri Dish with nutrients

• (1) Incubator (for entire class)-

keeps bacteria warm and helps

them grow!

• Scotch Tape

• Sharpie (to label dish)

Procedure and Data• Write a step-by-step procedure for how you

will collect and store bacteria and evaluate your results.

• Include a constant/standard! (What if your Petri dish itself is contaminated? We need a blank area to compare to!)

• Need help? See next slide, or pages 18-19

• Make a data table

• Will you collect quantitative or qualitative data? Make sure it will give you the information to answer your question!

Good Swabbing Technique- pp.18-19

Safety Considerations1. Don’t tear the agar.

2. Don’t touch the agar with your fingers.(hold dishes by the sides).

3. Once petri dish is swabbed, tape it shut and don’t open it again. EVER.

Due next time…

• Stop and think questions on page 20.

• Answer these in complete sentences ON NOTEBOOK PAPER or TYPED and PRINTED.

• Why? I need to assess your understanding.

• Take a picture of the questions before you go.