Module 4 Flashcards
What is quantitative data?
Numerical data; data values that are numerical representing quantities that can be counted or measured.
What Categorical Data?
Qualitative data; data that are in groups, such as names or labels, and not necessarily numerical.
What are examples of quantitative data?
height, weight, blood pressure, blood cholesterol level
What are examples of qualitative data?
gender, ethnicity, marital status, eye color
What are two types of displays for categorical data?
- Pie chart
2. Bar chart
What are four graphical displays that can be used for quantitative data?
- Dot plot (for small data sets)
- Stem plot (stem and leaf plot)
- Box plot (center, spread and outliers)
- Histogram (shape and spread)
What is bimodal distribution?
A distribution that has two clear peaks rather than one
What is a multimodal distribution?
A histogram with two or more clear peaks
What is the mean?
aka the average. Add all the data and divide by the number of values
What is the median?
The middle number
What is the mode?
The most common number
what is the range?
The difference between the smallest and greatest values: maximum-minumum
What is the interquartile range?
the difference between the third quartile and the first quartile
What are outliers?
any points that are more than 1.5x IQR above Q3 or below Q1
i.e. if IQR is 5.5, Q 3 is 8, then 5.5x1.5=8.25 and any number greater than 16.25 are outliers.
As well if Q1 is 2.5; then 2.5-8.25 is -5.75. Any value less than -5.75 are outliers
What is a five-number summary?
A list of the minimum, first quartile, median, third quartile, and maximum in a data set.
