What is a dependent variable?
The variable that is being measured
What is an independent variable?
The variable that can be changed or manipulated
What is a controlled/constant variable?
A variable that stays the same throughout the experiment
What is the experimental group?
A group in an experiment that you test on
Definition of standard deviation:
Measure of variation from the mean.
What is the formula for finding standard deviation?
For normal samples: σ={[((x-x)²)]/N}. For smaller samples: s = {[((x-x)²)]/(N-1)}
What is a control group?
A group that has not been experimented on and is used for comparison for the experimental groups.
Which graph axis would the dependent and independent variables go on?
Dependent variable - Y Axis, Independent variable - X Axis
How do you write a hypothesis?
Step 1: Come up with a specific reason that explains the phenomenon. Ex: The <phenomenon, topic> (is due to, caused by, depends on) <specific>. Strong Statements need to be very specific in how you can measure the reason/independent variable. Step 2: Write a testable statement. Ex: If <independent variable</specific>
For standard deviation, if the number is larger, what does that tell you about the data collected?
The data is spread out & there is a variety
In the experiment ‘Does temperature affect the rotting time of an apple?’ What is the independent variable?
Temperature
In the experiment ‘Does temperature affect the rotting time of an apple?’ What is the dependent variable?
Rotting time of the apple
For standard deviation, if the number is smaller, what does that tell you about the data collected?
The data is closer together
In the experiment ‘Does temperature affect the rotting time of an apple?’ What is a constant variable?
Location, water/humidity, light exposed to it…
For standard deviation, if there is no overlap between two samples of the same subject of data, what does that tell us about the significance of the data change?
It shows us how the different data samples are statistically significant.
For standard deviation, if there is overlap between two samples of the same subject of data, what does that tell us about the significance of the data change?
It shows that the different samples of data are not statistically significant.
What is experimental design?
It is how you design and setup an experiment.
If you have data points of 13, 15, 18, 19, and 23, what is the standard deviation?
Around 3.4
If you take a sample of average amount of plastic in ducks at two different time periods and the sample from the 1900s is 3 grams on average with a standard deviation of 1 gram, and your sample from 2000s shows an average of 6 grams on average with standard deviation of 2 grams, what can we infer about the data samples?
We can infer that; the data has a statistically significant change, that the average amount of plastic increased over time, that the standard deviation has increased over time, that the average high of plastic in ducks has doubled according to the standard deviation.
If you take a sample of average amount of sugar free foods carried in Meijer at two different time periods and the sample from the 1900s is 100 pounds on average with a standard deviation of 15 pounds, and your sample from 2000s shows an average of 130 on average with standard deviation of 20 pounds, what can we infer about the data samples?
We can infer that; there is no statistically significant difference, the average amount of sugar free food in Meijers has increased, the average high of sugar free foods has increased.
