What Even Is Data Science?
Using data to better understand and solve real-world problems.
What is Data Science?
This sampling method is used when a researcher selects every 15th person who passes by the library.
What is systematic sampling?
Both GPA and Number of siblings fall into this broader variable type.
What is quantitative data?
This type of graph should be produced if you want to look at the shape of quantitiative data.
What is histogram?
The code chunk below is reading in this type of file.
import pandas as pd
df = pd.read_csv("/content/drive/MyDrive/Math 2800 Data/np_traffic.csv")
What is reading in a csv?
These are the measures of center and variation discussed in class.
What are the mean, median, mode, range, IQR, variance, and standard deviation?
What are observations?
This sampling method is used when a researcher divides people into age groups and randomly selects a few people from each age group.
What is stratified sampling?
Both Likert scale ratings and car color fall into this broader variable type.
What is qualitative data?
This type of graph should be produced if you want to identify outliers.
What is a boxplot?
This function in python gives us a glimpse of first few rows of data.
What is head()?
The term robust is used to describe this phenomenon.
What is a measure that is not influenced by outliers?
This principle means that no amount of fancy analysis can make up for bad data.
What is GIGO (garbage in, garbage out)?
This sampling method is used when a researcher randomly selects three different classrooms at a school and interviews all students in each classroom.
What is cluster sampling?
The time it takes to get ready in the morning is an example of this specific type of data and its subclassification.
What is quantitative continuous data.
This type of graph is useful when you have a categorical variable with few categories.
What is a pie chart (also bar chart)?
By default describe() gives us this information on this type of variable? (Looking for two key things)
What is descriptive statistics on quantitative variables?
This rule is used to approximate probability when looking at a normal curve.
What is the empirical rule?
This is the threshold for identifying an outlier.
What is 1.5 times the IQR beyond quartile 1 or 3?
This sampling method is used when a researcher asks each person interviewed to provide the name of another person who might participate.
What is snowball sampling?
The number of cookies consumed while studying is an example of this specific type of variable classification and subclassification.
What is quantitative discrete?
This type of graph orders categorical data by frequency.
What is a pareto chart?
This function in python allows us to quickly see column names, number of rows, data types, and number of non-missing values.
What is info()?
This is the reason we prefer the standard deviation over the variance.
What is the variance is in squared units?
These are the three different classifications we gave to missing data.
What are MCAR (Missing completely at random), MAR (Missing at random), MNAR (Missing not at random)
This sampling method is used when a researcher posts an online poll and lets anyone who wants to participate respond.
What is volunteer sampling?
This subclassification represents qualitative data that has a natural order to it.
What is ordinal data?
This type of graph is useful when looking at many (3 or more) quantitative variables and one qualitative variable.
What is a pairwise scatterplot
What is a data frame?
This is the unit of measure that z-scores are measured in.
What are standard deviations?