Describing Distributions with Numbers
While graphs give you a picture of the data, often hard core numbers need
to be used to describe and/or summarize the center, spread, and shape of a
QUANTITATIVE data set. To distinguish between describing a populatio
Introduction
Statistics encompasses the design of experiment or sampling
procedures, the collection and effective presentation of the DATA,
proper DATA analysis and the facilitation of wise decisions made
in the face of uncertainty.
There are two areas of
Introduction
Statistics encompasses the design of experiment or sampling
procedures, the collection and effective presentation of the DATA,
proper DATA analysis and the facilitation of wise decisions made
in the face of uncertainty.
There are two areas of
Sampling Distributions
The statistical techniques used to predict a POPULATION value based on
SAMPLE data or to make a decision about a POPULATION value based
on SAMPLE data, must account for sampling error in order to generate valid
results. How to measu
Discrete Probability Models, including Binomial Models
When the random experiment generates a discrete (countable) quantitative
outcome (i.e. variable) and the Sample Space of outcomes for the variable
is NOT infinite, the probability model is called a Di
Continuous Probability Distributions & Normal Probability Distribution
When the random experiment generates a continuous (measurable)
quantitative variable, the Sample Space of outcomes for the variable is
infinite. The DISTRIBUTION of probabilities (prob
Finding a Numerical Value for X Given a Probability
Occasionally you will be GIVEN a probability and want to FIND the value of
the normal variable (X#) that corresponds to this probability.
Example: A large discount store sells Snurdhopper CD-R 80min 700M
676
TABLES
Table entry for z is the area under
the standard Normal curve to the
left of z.
TA 8 L E A Standard Normal cumu1ative proportions
I |
ro [w [\J
.00
.0003
.0005
.0007
.0010
.0013
.0019
.0026
.0035
.0047
.0062
.0082
.0107
.0139
.0179
.0228
.028
Scatter Plots & Correlation
A frequent request/goal/question is to describe a relationship between 2
QUANTITATIVE variables. The 2 quantitative variables may have a linear
relationship or a non-linear relationship or no relationship at all.
To investigate