1. #11 What is the independent variable in this experiment?
I want to test different soap products to see which product kills the most bacteria on my hands.
What is the independent variable in this experiment?
What is the dependent variable?
What would be the control group?
List 2 constants.
Answers:
Type of soap (1)
Number of bacteria (1)
Normal hand, no soap (1)
Amount of product, time of day washing, length of washing, etc. (2)

2. All Class Data Product Control Group Experimental group Difference
Anti bac foaming soap
(orange)
892 79
370 50
390 22
-842
311
-348
Sanitizer
473; 670
202
110
206; 174
377
126
-267
-496
175 16
Non anti bac soap
(blue)
1895
161
251
1776
104 12
-119
-57
-239
Water only
944
354
400
1423 76
248
479
-278
-152
Difference =Experimental-control

3. Product
Difference
% Difference
Anti bac foaming soap
(orange)
-842
311
-348
94% Decrease
394% increase
94% decrease
Sanitizer
-267
-496
175 16
56% decrease
74% decrease
87% increase
14% increase
Non anti bac soap
(blue)
-119
-57
-239
6% decrease
35% decrease
95% decrease
Water only
479
-278
-152
50% increase
78% decrease
38% decrease

4. Remove outliers (any number that increased)
Product
Difference
% Difference
Anti bac foaming soap
(orange)
-842
311
-348
94% Decrease
Sanitizer
-267
-496
175 16
56% decrease
74% decrease
Non anti bac soap
(blue)
-119
-57
-239
6% decrease
35% decrease
95% decrease
Water only
479
-278
-152
78% decrease
38% decrease
How do you graph remaining data?

5. Rank Most effective (1-4)
Product
% Difference
Average % Difference
Rank Most effective (1-4)
Anti bac foaming soap
(orange)
94% Decrease
94%
Sanitizer
56% decrease
74% decrease
65%
Non anti bac soap
(blue)
6% decrease
35% decrease
95% decrease
45%
Water only
78% decrease
38% decrease
58%

6. % Change in bacterial colonies
Type of Product
Figure 1.1: Bacterial Analysis after Hand cleansing with different products

7. #12 What is the independent variable in this experiment?
Eva and Lucy decide to test the effects of how much sleep a student gets on the academic performance of that student. They select 20 juniors (10 male and 10 female) to study. All students have GPA’s between 3.5 and 4.0, and are all of similar ethnic backgrounds. Eva and Lucy instruct the students to get 9 hours of sleep every night for a week, and give the students a standardized test on Friday. The next week, students are only allowed 8 hours of sleep every night before taking a similar test the following Friday. They continue to vary the amount of sleep down to only 5 hours per night, and record data about how they perform on a standardized test each week.
What is the independent variable in this experiment?
What is the dependent variable?
Name two constants they keep.
Write a hypothesis for this experiment.
Answers:
Amount of sleep (1)
Test score (1)
Same GPA, same age, similar ethnic backgrounds, etc. (1, .5 pts each)
If the amount of sleep decreases, then the test score will decrease. (2) Answers will vary. Grade on proper format.

8. Individual Practice .

9. 1

10. Science v. Technology
Science
advances
Knowledge
Technology
Society 2

11. Science v. Technology Science does lead to New Technology.
**The goal of Technology is to solve problems, whereas science is aimed at answering a question.** 3

12. Technology: application of scientific discoveries to meet human needs and goals through the development of products and processes 4

13. Four stages of technological design:
Problem Identification
Clearly define the problem or need
Solution Design
Brainstorm, research, sketch, and narrow down to best design for product or process
Implementation
Build and Test – make improvements as needed
Evaluation
Determine if you solved the problem/met all constraints 5

14. Common requirements within the Solution Design stage:
Cost effectiveness or lowest cost
Time effectiveness or least amount of time required
Materials that meet these criteria:
Reasonably priced
Availability
Durability
Not harmful to users or the environment
It’s nearly impossible to have the perfect design, but in general shoot for the:
Benefits >>> risks 6

15. Scientific Investigation vs. Technological Design
Identifies a problem – asks a question
Researches related information
Designs an investigation or experiment
Conducts the investigation or experiment – repeated trials
Analyzes the results
Evaluates the conclusion – did the results refute or verify the hypothesis?
Communicates the findings
Identifies a problem or need
Researches related information
Designs a process or a product
Implements the design or the process – repeated testing
Analyzes the results
Evaluates the process or product – did it meet the criteria?
Communicates the product or process 7

16. 1. Technology
Vocabulary Cards

17. List the first 2 steps of the technological design process.
Exit Ticket
List the first 2 steps of the technological design process.

19. #13 List the 4 steps of the technological Design process. Answer:
Students should draw a nucleotide and label the phosphate group, 5-carbon sugar, and nitrogenous base. (3 pts for parts, 2 points for correct bonds)