IV & DV
A student wants to test how different amounts of sunlight affect plant growth. What is the independent variable?
The amount of sunlight the plants receive
Qualitative or Quantitative? : The foam rose by 20ml.
Quantitative
Students test if the type of liquid (water, soda, juice) affects how fast seeds germinate. What should they keep constant?
Amount of liquid given, location of seeds, sunlight on seeds, etc
A scientist tests if music affects how fast hamsters run on a wheel. What should the scientist measure as the dependent variable?
Speed of hamsters
What goes in the "if" part of a hypothesis?
The IV
A group of students gathers their materials for the lab and notes they have 40 ml of blue solution and 2 white tablets. Is this an observation of Exerpimental DESIGN or is it DATA?
Design!
Students test if the type of liquid (water, soda, juice) affects how fast seeds germinate. What is the IV?
The type of liquid
What goes in the "then" part of a hypothesis?
The DV
A group of students is observing pillbugs in a choice chamber. As the experiment progresses they count 10 pillbugs on the side of the chamber with the disco light in it. Is this an observation of experimental DESIGN or is it DATA?
Data!
A teacher sets up two fish tanks: one with fertilizer added and one without. Give a possible hypothesis for this experiment.
If _________, then __________. (answers vary)
Which vocab word identifies the factors that should be kept the same between the control group and the experimental group ?
Constants
Researchers are observing the effect of adding growth hormones to oak trees. What is one example of QUALITATIVE data and one example of QUANTITATIVE data they could collect?
Answers may vary!
Qualitative = descriptive
Quantitative = numerical
A Maine South Cross Country member is testing out a new pair of shoes to see if it lowers her race time at the next meet. What is the DV?
A pharamicist set up a study to determine whether Vitamin C could reduce cold symptoms. 10 volunteers were split into two equal groups. For two weeks, members of Group 1 took 1 tablet of the Vitamin C. Group 2 took a placebo (a sugar pill that does not contain the supplement). At the end of the two-week period, the pharmacist exposed the volunteers to germy preschoolers. The volunteers in both Group 1 and Group 2 continued to take their daily pills. All the volunteers developed symptoms of a cold, and there was no significant difference in the length of time the cold symptoms lasted. Make a claim about the Vitamin C.
The Vitamin C was ineffective in reducing cold symptoms.
Be the first group to stand up and shout "Hooray!"!
Hooray! :)