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 measurement is taken.
A population is a collection of elements
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 to one another, the variance shows that the
mathematica
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
satisfied or unsatisfied.
The company wants to know what
pr
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, and this is almost exactly what occurred. Of course,