Point estimation and interval estimation
to understand the relationship between point
estimation and interval estimation
to calculate and interpret the confidence
Every member of the
population has th
Statistical Methods in Clinical
James B. Spies M.D., MPH
Professor of Radiology
Georgetown University School of Medicine
Summarizing data using descriptive statistics
Testing the Difference Between Two
Means (Large Samples)
We assume that before you study this document you will have reviewed an earlier
document called "Hypothesis Testing, An Overview".
In this document we shall do a hypothesis test for the mean of a po
Population can be thought of as a set of measurements ( or
counts), either existing or conceptual.
A sample is a subset of measurements from the population.
A parameter is a numerical descriptive measure of a
Statistics is numerical descri
Statistics is the study of how to collect, organize, analyze and interpret
numerical information from data.
Individuals are the people or objects included in the
A variable is the char
3. Time plots
Features of a bar
1. Bars can be vertical or
2. Bars are of uniform width and uniformly
3. The lengths of the bars represents values of the variable
STA 570 001-002
The choice of is an arbitrary choice. There is good
reason for to be small, but no definitive reason to
choose a particular value.
Of course, many fields require =0.05, but that
doesnt mean it is the correct
MEP Pupil Text 5
Probabilities are used to describe how likely or unlikely it is that something will happen.
Weather forecasters often talk about how likely it is to rain, or perhaps snow, in particular
parts of the country