Wed/Thurs 7/30-7/31 for 10 Points Causal vs. Descriptive Worksheet due Wed/Thurs 7/30-7/31 for 20 Points Concept 1: Observations, Questions & Hypothesis PO1: Evaluate scientific information for relevance to a given problem PO2: Develop questions from observations that transition into testable hypotheses. PO3: Formulate a testable hypothesis PO4: Predict the outcome of an investigation based on prior evidence, probability and/or modeling (not guessing or inferring). Steps to the scientific method?
1ST YOU MAKE OBSERVATIONS 2nd ask questions 3rd come up with a possib 4th perform your experiment 5th analyze your data 6th make conclusions Causal VS Descriptive There 2 types of questions: CAUSAL & DESCRIPTIVE CAUSAL:
-questions into the cause(s) or explanation(s) of a phenomenon by asking WHY or HOW something happens or the way it is. DESCRIPTIVE: -asks WHAT, WHERE, WHEN, & WHO of some observed object, an event or situation. WHAT TYPES OF QUESTIONS ARE THESE? Why is the sky blue? Causal
Who are my lab partners? Descriptive What am I going to learn in this class? Descriptive How does it get so hot in Arizona? Causal When does school start? Descriptive
Why do dogs bark? Causal WORKING THE WASHING MACHINE Its time for you to do a load of laundry. You go to start the washing machine, but nothing happens Now COME UP WITH A
CAUSAL QUESTION TO THIS SCENARIO. WHY WON'T THE WASHER START? Now come up with POSSIBLE reasons why it won't start it's not plugged in
the circuit breaker is out there is a wire loose Those possible explanations were. HYPOTHESES Wednesday/Thursday 7/307/31/2014 Agenda:
Q1 Wk1 D5 Scientific Method *Notes: Writing Hypothesis Statements *Activity: Hypothesis Practice *Notes: Variables in an experiment *Activity: Variables worksheet Practice
Homework: Hypothesis Practice Worksheet due in class today 7/30-7/31for 20 Points Variables Practice Worksheet due Friday 8/1/2014 for 30 Points WRITING HYPOTHESES WHAT IS A HYPOTHESIS ANYWAY??? A Hypothesis is
A possible explanation that can be tested It is NOT an educated guess! EARLY RISER EXAMPLE: Jerry is a 1 year old boy who is waking up at 5:00 each morning. As far as his parents were concerned, this was too early. 1. WHAT IS A CAUSAL QUESTION FOR THIS SCENARIO? 2. GIVE A POSSIBLE EXPLANATION 3. HOW WOULD YOU TEST THIS? What SHOULD happen if your test is correct?
EARLY RISER EXAMPLE: Jerry is a 1 year old boy who was waking up at 5:00 each morning. As far as his parents were concerned, this was too early. 1. WHAT IS A CAUSAL QUESTION FOR THIS SCENARIO? ANSWER: Why is Jerry waking up at 5 A.M. each morning? 2. GIVE A POSSIBLE EXPLANATION ANSWER: Jerry is hungry; Jerry needs his diaper changed; The sunlight is waking him up 3. HOW WOULD YOU TEST THIS? ANSWER: Feed Jerry at a later time, before he goes to bed so he could sleep in later.
Check Jerrys diaper during the night. Put drapes over the windows so the sunlight will not get through. Date: Thursday, 7/26th Q1 WK 1 D4 Writing a Hypothesis Statement Hypothesis Statements are written in an IF.ANDTHEN. FORMAT
IF = HYPOTHESIS (possible explanation) AND= HOW you will test your hypothesis THEN= EXPECTED or PREDICTED results Apply this to the Early Riser Example; develop a Hypothesis Statement Early Riser Example: Hypothesis Statement Possible Hypothesis Statements: 1.
If baby Jerry is hungry and he is fed at a later time before going to bed, then baby Jerry will sleep in later than 5:00 A.M. 2. If baby Jerry needs his diaper changed and his diaper is checked and changed in the middle of the night, then baby Jerry will sleep in later than 5:00 A.M. 3. If the sunlight is coming into baby Jerrys room, and drapes are put over all
of his windows to cover the sunlight, then baby Jerry will sleep in later than 5:00 A.M. If, and, then Practice worksheet Handout- in sci. ntbk Hypothesis Statement Practice Worksheet Handout worksheet- in
Date: Tues, July 30th Q1 WK2 D2 Parts of an experiment? 1. INDEPENDENT VARIABLE 2. DEPENDENT VARIABLE 3. CONSTANTS 4. CONTROL 1. INDEPENDENT VARIABLE (IV)
The variable that is being CHANGED or MANIPULATED Also known as the IV in an experiment. In the picture to the left, what is the I.V.? (The variable being CHANGED / MANIPULATED) 2. Dependent Variable: (DV) The responding variable; the variable that is being MEASURED.
Also known as the DV in an experiment! EXAMPLE: A group of students were given a short course in speedreading. The instructor was curious if a monetary incentive would influence performance on a reading test taken at the end of the course. Half the students were offered $5 for obtaining a certain level of performance on the test, the other half were not offered money. The incentive (money) after a course in speedIndependent Variable: reading Performance on a reading test Dependent Variable:
Independent VS Dependent Variable EXAMPLES: 1. There will be a statistically significant difference in graduation rates of at-risk high school seniors who participate in an intensive study program as opposed to at-risk high-school seniors who do not participate in the intensive study program." IV: DV:Intensive study program Graduation rate of at-risk high school seniors
Independent VS Dependent Variable EXAMPLES: A scientist wants to investigate whether plants need sunlight to grow. The hypothesis being tested is: 2. Plants require sunlight to grow. The scientist placed one tray of sunflower seedlings in the sun and another tray of sunflower seedlings in a cupboard in the laboratory. The seedlings were watered and after 6 weeks the height of each seedling was measured. I.V. :
D.V. : The amount of sunlight given to each tray of sunflower seedlings The height of each sunflower seedlings after 6 weeks 3. CONSTANTS All variables that MUST remain the same during the experiment. Mrs. Ellison has a patch of sweet corn behind the school. In the past, she has only planted corn without fertilizer. She wants to
see if the sweet corn will grow better with a fertilizer from her cats litter box. Mrs. Ellison plants one row of corn with the fertilizer and another row without the fertilizer. Both rows were planted in the same area and in the same type of soil. Both rows were also planted with the same exact type of seed. 1. Seed type 2. Soil type exposure 3. Area planted 4. Sun
5. Amount of water given 6. Tools used to plant seeds 7. Identifying Variables- Practice 1. Fertilizer in soil increases flower production. IV:______, DV: _______, 2 Controls: _____ & _____ 2. If zinc tablets are taken, then the number of colds per year is reduced. IV: _____, DV: ______, 2 Controls: _____ & _____ 3. If water is present, then the number of bacteria in garbage bins
increases. IV: _____, DV: _____, 2 Controls: _____ & _____ IN YOUR SCIENCE NTBK 4. CONTROL A group that is NOT being manipulated or is NOT BEING TESTED by an experimental process. It is used to compare results to the experimental group.
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