Experimental Design

1
Experimental Design

• Starter 8.16.07

2
Daily ObjectiveWrite your daily objectives on
page 2 of your notes notebook.

• I will be able to identify two types of
  scientific data.
• I will be able to give examples of when I have
  collected qualitative and quantitative data.
• When designing an experiment, I will be able to
  select the appropriate type of data that I will
  collect in my experiment

3
Class Agenda 8.16.07

• Starters Begin Working on Your Starters
• Setting your Academic Goal in Science
• Take up the Academic Goal assignment
• Pass out the syllabus
• Recording your Grades
• Collect each students Academic Goal
• These will be stapled inside your individual
  academic folder
• You will be expected to record your progress on
  all test and graph them.
• This graph will count as a test grade.
• You will have to interpret the graph or tell me
  what the graph is saying about your learning
• Collect Lab Fees, Science Lab Agenda Books
• Discuss the Starters
• UK Pre-Test
• Grade these in class if we have time today.
• We will talk about the projects in more detail
  later

4
Practice Problem 1

• Determine if the hypothesis is supported by the
  data. Explain why?
• Katherine thought that people would be able to
  taste small amounts of sugar more easily than
  vinegar or salt. She found that people could
  detect 2 ml of salt in a liter of water. However,
  they needed only 1.5 ml of sugar per liter of
  water and .5 ml of vinegar to taste the
  substance.
• 1. Answer

5
Practice Problem 2
Amount of Salt in Water Height of Top of Eggs (cm) Trials Height of Top of Eggs (cm) Trials Height of Top of Eggs (cm) Trials
Amount of Salt in Water 1 2 3
0 4 4 4
10 5 6 5
20 8 8 8

1. Would you describe the data in the chart as
   qualitative or quantitative?
2. Explain your answer.

6
Practice Problem 3
Amount of Salt in Water Height of Top of Eggs (cm) Trials Height of Top of Eggs (cm) Trials Height of Top of Eggs (cm) Trials
Amount of Salt in Water 1 2 3
0 4 4 4
10 5 6 5
20 8 8 8

1. What conclusion might you draw from the data
   presented in the chart above?
2. Can you find any trends or patterns in the data?

7
Practice Problem 4
Amount of Salt in Water Height of Top of Eggs (cm) Trials Height of Top of Eggs (cm) Trials Height of Top of Eggs (cm) Trials
Amount of Salt in Water 1 2 3
0 4 4 4
10 5 6 5
20 8 8 8

1. Find the average height of top of eggs for each
   level.
2. Why are repeated trials important to an
   experiment?

8
Practice Problems Answers

• The data collected is quantitative data because
  the information is collected in a numerical form.
  (i.e. 0, 1, 2, 3, 4, 5)
• A. I would conclude that an egg with float better
  or higher in water that contains more salt (a
  higher concentration of salt).
• B. I notice that when the amount of salt is
  doubled, the height of the egg floating doubles.
  
• A. The average height of the egg in each
  solution would be 4, 5.3, and 8, respectively
• B. By repeating the experiment, we can obtain
  the best results by average or finding the mode
  of the data.

9
(No Transcript)