Defining and Collecting Data
Organizing and Visualizing Variables
Measures of Central Tendency and Variation
Descriptive Measure for the Population
Other Descriptive measures for numerical data
100
A variable that can only be integer numbers
What is a discrete numerical variable?
100
A graph that shows a bar representing the count of each category in a categorical variable
What is a bar chart?
100
It is the middle value with half of the data above and half below it
What is the median?
100
μ
What is the greek letter that represents the population mean?
100
It consists of the minimum and maximum, the quartiles Q1 and Q3, and the median.
What is the 5-number summary?
200
A sample drawn by selecting the Kth individual systematically from a sampling frame
What is a systematic sample?
200
A graph that shows how a "whole" divides into categories by showing a wedge of a circle whose area corresponds to the proportion in each category
What is a pie chart?
200
Summing all the data values and dividing by the total number of observations.
How do you find the mean?
200
It is the squared root of the sum of squared differences around the population mean, divided by the population size.
What is the population standard deviation?
200
A measure that describes the extent to which data values are NOT symmetrical.
What is the skewness?
300
The temperature in Fahrenheit
What is an example of an INTERVAL level of measurement (does 0 mean no temp???)?
300
A graph that plots the values of one numerical variable on the X axis, and the values of a second numerical variable on the Y axis.
What is a scatter plot?
300
It is the sum of squared deviations from the mean, divided by the total number of observation minus one.
What is the variance?
300
68%
What percentage of the values are within +/- 1 standard deviation from the mean, according to the empirical rule?
300
A measure of the relative strength of a linear relationship between two numerical variables.
What is the coefficient of correlation?
400
All students in a class are divided into groups according to the the State they come from. A sample of students representing each State is randomly selected.
What is an example of a stratified sample?
400
A table that displays counts and, sometimes, percentages of individuals falling into named categories on two or more variables; categorizes the individuals on all variables at once, to reveal possible patterns in one variable that may be contingent on the category of the other
What is a contingency table?
400
It is the difference between the value and the mean, divided by the standard deviation.
What is the Z-score?
400
It is used to examine the variability in a population that is symmetrically distributed.
When is the empirical rule used?
400
The difference between the third and the first quartile.
What is the interquartile range?
500
It results from the exclusion of certain groups of subjects from a population frame.
When does coverage error occur?
500
A chart that helps identify the "vital few"
What is a Pareto chart?
500
A measure of variation that measures the scatter in the data relative to the mean and shows in it in percentage.
What is the coefficient of variation?
500
88.89%
What is the percentage of values found within +/- 3 standard deviations from the mean, regardless of the distribution?
500
A distribution that has a sharper-rising center peak than the peak of a normal distribution.
What is a lepokurtic distribution?
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