Week 1 Flashcards
What are the things that exist in the center of a normal curve?
Mean, median and mode
What does an inflection point on a normal curve mark?
A standard deviation from the mean
The distributions of most continuous random variables will follow the shape of the ____
The distributions of most continuous random variables will follow the shape of the normal curve
What does the empirical rule state?
- 68% of all values fall within 1 standard deviation of the mean
- 95% of all values fall within 2 standard deviation of the mean
- 99.7% of all values fall within 3 standard deviations of the mean
What are the 3 major types of central tendency?
Mean, median, and mode
____ refers to the measure used to determine the center of a distribution of data.
Central tendency refers to the measure used to determine the center of a distribution of data.
What is central tendency used for?
It is used to find a single score that is most representative of an entire data set
What is a data set with 2 modes called?
Bi-modal
A data set with more than one mode can be described as ___
Multi-modal
____is mostly used to represent the central tendency, but sometimes outliers can interfere with its usage
Mean is mostly used to represent the central tendency, but sometimes outliers can interfere with its usage
What is an outlier?
A value that is very different from the other data in the data set
What is a variable?
A property that can take on many values
What are the two kind of variables?
Quantitative variables and qualitative/categorical variables
What is a quantitative variable and what kind you do with it?
Variables measured numerically. With quantitative variables, can do things like add and subtract, multiply and divide, and get a meaningful result
_____ allow for classification based on some characteristic
*Qualitative/ categorical variables allow for classification based on some characteristic
What are the two types of quantitative variable?
Discrete variables and Continuous variables
Whta is a discrete variable?
A quantitative variable with a finite number of values. Ex: the amount of even numbers on a dice
What is a continuous variable?
A quantitative variable with an infinite number of values Ex: temp
What is an independent variable?
Any variable that is being manipulated
What is a dependent variable?
Any variable that is being measured
What are the four data types of measured variables?
- Nominal
- Ordinal
- Interval
- Ratio
_____ data (also known as qualitative/categorical data) is data that is split into categories (dichotomous)
Nominal data (also known as qualitative/categorical data) is data that is split into categories (dichotomous)
____ data is data where order matters, but distance between values does not
Ordinal data is data where order matters, but distance between values does not
____ data is where order matters, and distances between values are qual and meaningful, but there is no natural zero present
Interval data is where order matters, and distances between values are qual and meaningful, but there is no natural zero present
____ data is data where order matters, distances between values are equal and meaningful, and a natural zero is present
Ratio data is data where order matters, distances between values are equal and meaningful, and a natural zero is present
___ is best for numeric symmetrically distributed data
Mean is best for numeric symmetrically distributed data
___ is best for numeric non-symmetrically distributed data
Median is best for numeric non-symmetrically distributed data
What level of measurement is dichotomous?
Nominal
Gender is a ___ level of measurement
Gender is a nominal level of measurement
Time is a ___ level of measurement
Time is a ratio level of measurement
Age is a ___ level of measurement
Age is a ratio level of measurement
