Term
What is the difference between Numerical and Categorical Variables? 

Definition


Term

Definition
Used for categorical varibles 


Term

Definition
Watching, not controlling variables 


Term

Definition
Researchers choose groups randomly 


Term
What are the 3 ways to display Numerical Distribution? 

Definition
1. Histogram
2. Dot plot
3. Stem plot
4. Box plot 


Term
What are the 3 features discusses for Numerical Distribution? 

Definition
1. Shape (symmetrical, bimodal, unimodal)
2. Spread (IQR or Range)
3. Center (Median) 


Term
What are the 2 ways to display Categorical Distribution? 

Definition
1. Bar Chart
2. Pie Graph 


Term
What are the 2 features of a Categorical Distribution? 

Definition
1. Variability (diversity)
2. Mode (thing that occurs the most) 


Term
3 shapes in Mean vs Meadian in skewed distribustion 

Definition
1.Mean=Meadian→symmetric
2. Mean>Median→rightskewed
3.Mean<Median→leftskewed



Term

Definition
Interquartile Range, how spread out the middle 50% of data is (measure of spread)
Q3Q1 


Term
What measures are resistant to outliers? 

Definition
1. Median (center)
2. IQR (spread) 


Term
What are the 4 features used to describe a scatterplot? 

Definition
1.Trend (positive or negative)
2.Strength (weak or strong)
3.Shape (liner or not)
4. Outliers 


Term
How do we find potential outliers? 

Definition
Any point 1.5XIQR away from Q1 or Q3(edges of the box) 


Term
What is the Five Number Summary? 

Definition
1.Min
2.Q1
3.Median
4.Q3
5.Max 


Term

Definition
Type of letter groupings (x) 


Term

Definition
# of letter memorized (Y) 


Term
What is the Emperical Rule? 

Definition
The rules gives the approximate % of observations w/in 1 standard deviation (68%), 2 standard deviations (95%) and 3 standard deviations (99.7%) of the mean when the histogram is well approx. by a normal curve 


Term

Definition
y=a+bx
a=(yintercept)
bx(slope) 


Term

Definition
1. 1≤r≤1
2. r positive (+ trend)
r negative ( trend)
3. strength
close to 1 or 1 (strong)
close to 0 (weak) 


Term

Definition
a test procedure in which the identity of those receiving the intervention is concealed from both the administrators and the subjects until after the test is completed 


Term

Definition
another term for proportion; number of times event occurs divided by the number of trials (long run) 


Term

Definition
making predictions beyond intended bounds 


Term
Coefficient of Determination 

Definition
r²
Reported as a percent
measures the variation in the response variable 


Term

Definition
How many times the value occured in the collection of data (count) 


Term

Definition
When someone who doesn't see the participants or doesn't participate in determining the results handles the assignment group 


Term

Definition
Assignment is left to chance (Flipping a coin) 


Term

Definition
It's the individual entities whose characteristics are measured (In a study of flaws in a manufacturing system, an "observational unit" might be a toy that the system produces) 


Term
Is a mean resistant to outliers? 

Definition


Term
Is a Median resistant to outliers? 

Definition


Term
Is the standard deviation resistant to outliers? 

Definition


Term
Is the (Lower QuartileUpper Quartile) ÷ 2 resistant to outliers? 

Definition


Term
Is the (MaximumMinimum) ÷ 2 resistant to outliers? 

Definition

