Chapter 19 Biostatistics Flashcards
field of study that focuses on
(1) the collection and analysis of data and
(2) the drawing of
inferences about a collection of data when only a part of the data is available for analysis.
Statistics
can help researchers
distinguish random variation from real differences when drawing
conclusions.
Statistical analysis
Sources of data
Routinely kept records
Survey
Experiments
External sources
counts are also called
frequencies
characterized by interruptions or gaps in its values
Discrete random variable
does not have interruptions or gaps in its values, or it can assume any value within an interval between any two of its values.
Continuous random variable~ fuck this irrelevant shit
includes every member of all
entities that one is interested in at a particular time
Population
is a sample selected
from a population such that every possible sample of the same size has
the same chance of being drawn
Simple random sample
A commonly used rule of thumb is that one should have between \_\_\_\_\_ and \_\_\_\_ class intervals
6 and 15 class intervals
is the number of observations falling in a particular class interval.
Frequency
is the sum of all observations within a certain
interval and within all preceding intervals
Cumulative frequency
is the proportion of observations within a certain class interval. %
Relative frequency
is the sum of the proportion of observations within a certain class interval and within all preceding intervals. %
Cumulative relative frequency
ODD MEDIAN
MIDDLE VALUE
ODD EVEN
AVERAGE OF TWO MIDDLE VALUES
