Lab Safety
What will not be tolerated in the lab?
Horseplay
Oceanic birds are larger than land birds. Is this an observation or inference?
Observation
What are the three requirements for a good hypothesis?
1. It has to be a statement
2. It has to be testable
3. It has to be measurable
A student wants to know if keeping screen brightness high drains a phone battery faster. They take three identical phones, set one to 30% brightness, one to 60% brightness, and one to 100% brightness. They play the same video on loop until each phone dies and record the total watch time.
What is the independent variable?
Screen brightness
The independent variable is on which axis?
X-axis
What is the biggest safety hazard in the lab?
Tripping
The sky is very dark and cloudy. Is this an example of an observation or inference?
Observation
If it rains everyday, then people will be sad.
What is wrong with this hypothesis?
It is not measurable-it involves emotions
A gardener wants to see if adding liquid plant food makes tomato plants grow taller. They set up four pots with the same type of tomato seed and soil. Plant A gets no plant food, Plant B gets 5 mL, Plant C gets 10 mL, and Plant D gets 15 mL added to their weekly water. After four weeks, they measure the final height of each plant.
What is the dependent variable?
Tomato plant growing taller
The dependent variable is on which axis?
Y-axis
What should you never put on a burn?
Ice
You measure a wooden table and find it is 1.5 meters long. This what type of observation?
Quantitative observation
If students eat breakfast before a math test, then they will score higher than students who do not eat breakfast.
Is this a good hypothesis?
Yes
A class tests whether adding salt to ice changes how fast it melts. They place three identical ice cubes on separate plates. Ice cube 1 gets plain, Ice cube 2 gets a pinch of salt, and Ice cube 3 gets a heavy spoonful of salt. They time how many minutes it takes for each ice cube to turn completely into liquid water.
What is one constant
Answers will vary
The title to a graph has to include what?
Independent and dependent variable
What happens if your voices are too loud in the lab?
Miss Najar blows the loud whistle
A researcher counts 45 monarch butterflies in a field. What type of observation is this?
Quantitative Observation
A hypothesis is an educated guess based on what?
Research or prior knowledge/experience
A consumer researcher wants to find out which brand of paper towel holds the most liquid. They test three popular brands. They cut each brand into an exact 5x5 inch square, dip a corner into a tray filled with 50 mL of colored water for 10 seconds, and then measure how many milliliters of water are left in the tray.
What is the dependent variable?
Which brand holds the most liquid
You measure the time it takes for a car to come to a stop. What type of graph would you use to display that data?
Line graph
If a lab involved liquids other than room temperature water, what safety rules do you have to follow (there are three things)?
Closed toe shoes, hair pulled back, goggles
A student touches a piece of sandpaper and notes that it feels rough and gritty. What kind of observation is this?
Qualitative Observation
If a painting has more colors, then people will like it more. Is this a good hypothesis?
No
A teacher tests if listening to classical music while studying helps students remember more vocabulary words. Two groups of students are given the same list of 20 words to memorize for 15 minutes. Group A studies in complete silence, while Group B studies while listening to a classical piano playlist through headphones. Both groups take the exact same vocabulary test afterward.
What is the independent variable?
Listening to classical music while studying
You compare tissue brands to see which is the strongest. What type of graph would you use to display that data?
Bar graph