Statistics
Presenters
Dr. Jeffrey R. Wilson
Arizona State University
[email protected]
480 965 5628
Statistics
Introduction- Some Basic Terminology
Data
An element is an object on which a measure
Catherine Ciancio
Homework Set #2
#39.
a) These histograms are essentially symmetric
b) The mean of the mathematical scores is higher than the verbal scores, however the
means seem to be pretty close
Review Example
A large utility
company has
650,000
residential
customers.
Annually, a
sample of 400
customers is
selected to
measure customer
satisfaction.
1
Customers rate satisfaction as either
sati
You can see that 948 of the simulated condence intervals (each based on a different
random sample of size 30) contain the true mean 100. In theory. 950 of the 1000 intervals
should cover the true mean