Fundamentals of Descriptive Statistics(Udemy Statistics for Data Science and Business Analysis) Flashcards
What is a Population
A collection of all items of interest
What is the variable representing population?
Capital N
What is a Sample
A subset of the populatio
What is the variable representing sample
lower case n
What is a parameter?
The numbers we obtain when working with a population
What is a statistic?
The numbers obtained when working with a sample
What are Nominal Variables?
They are not numbered and cannot be ordered, example would by types of cars or the 4 seasons
What are ordinal variables?
Data in categories that are not numerical but follow a strict order, i.e. disgusting food, neutral food, or delicious food would be ranked
What is an interval variable?
Cannot represent a ratio of things and does not have a true 0 like the weather, Fahrenheit and Celsius are intervals
What is a ratio variable
Can represent a ratio of things and had a true 0, things like # of objects would be ratio, Kelvin temp is a rati
What is a frequency Distribution Table?
It has two columns, the category itself and corresponding frequency
What is a pareto diagram?
A special type of bar chart in which categories are shown in descending number of frequency, has a line for cumulative frequency
What is a histogram?
Looks like a bar chart, but instead of one bar representing a categorical variable, it represents intervals of numbers, and the bars on the histogram touch to represent continuity
What is a side by side bar chart?
Compares multiple categorical variables together from a cross table format
What is a scatterplot?
Represents 2 numerical variables on each axis, interested in trends rather than one specific data point
