文档介绍：Exploring Marketing Research William G. Zikmund
Chapter 17:
Determining Sample Size
What does Statistics Mean?
Descriptive Statistics
Number of People
Trends in Employment
Data
Inferential Statistics
Make an inference about a population from a sample
Population Parameter Versus Sample Statistics
Copyright © 2000 by Harcourt, Inc. All rights reserved.
Population Parameter
Variables in a population
Measured characteristics of a population
Greek lower-case letters as notation
Sample Statistics
Variables in a sample
puted from data
English letters for notation
Making Data Usable
Frequency Distributions
Proportions
Central Tendency
Mean
Median
Mode
Measures of Dispersion
Frequency Distribution of Deposits
Frequency (number of
people making deposits
Amount in each range)
less than $3,000 499
$3,000 - $4,999 530
$5,000 - $9,999 562
$10,000 - $14,999 718
$15,000 or more 811
3,120
Amount Percent
less than $3,000 16
$3,000 - $4,999 17
$5,000 - $9,999 18
$10,000 - $14,999 23
$15,000 or more 26
100
Percentage Distribution of Amounts of Deposits
Amount Probability
less than $3,000 .16
$3,000 - $4,999 .17
$5,000 - $9,999 .18
$10,000 - $14,999 .23
$15,000 or more .26
Probability Distribution of Amounts of Deposits
Measures of Central Tendency
Mean - Arithmetic Average
µ, population; , sample
Median - Midpoint of the Distribution
Mode - the Value that occurs most often