1. The field of statistics deals with the collection,
presentation, analysis, and use of data to make
decisions and solve problems.
Statistical techniques can be used to describe
and understand variability.
IME 301

2. Inferential statistics makes a decision about a particular population.
Descriptive statistics are methods for
organizing and summarizing data.
Population refers to the collection of measurements
on all elements of a universe about which we wish to
draw conclusion or make decisions.
Sample is just a subset of observations selected from
the population
IME 301

3. Data Summary Data Display and Graphical Methods:
bar chart, pie chart, histogram
Measure of central tendency
sample mean, sample median, population mean, mode
Measure of spread (variability)
sample range, sample variance, sample standard deviation,
population variance, quartile, inter-quartile
Data Display and Graphical Methods, cont.:
box plot, frequency distribution, relative frequency
histogram, time plot
IME 301

4. Mean
Variance
Size n
Sample
Population N
IME 301, Sept 98