Basics of Statistics
Jarkko Isotalo
30
20
10
Std. Dev = 486.32
Mean = 3553.8
N = 120.00
0
2400.0
2800.0
2600.0
3200.0
3000.0
3600.0
3400.0
4000.0
3800.0
4400.0
4200.0
4800.0
4600.0
5000.0
Birthweights of children during years 1965-69
Time to Accelerate fr
3
Numerical Descriptive
Measures
USING STATISTICS @ Choice Is
Yours, Part II
3.1
3.2
Central Tendency
The Mean
The Median
The Mode
The Geometric Mean
Variation and Shape
The Range
The Variance and the
Standard Deviation
The Coefficient of Variation
Z Scor
An Introduction to Basic Statistics and Probability
Shenek Heyward NCSU
An Introduction to Basic Statistics and Probability p. 1/4
Outline
Basic probability concepts Conditional probability Discrete Random Variables and Probability Distributions Continuou
STATISTICS FORMULAS
DESCRIPTIVE STATISTICS:
HYPOTHESIS TESTING MEANS:
MEAN:
STANDARD ERROR:
VARIANCE:
MARGIN OF ERROR: m =
STANDARD DEVIATION:
CONFIDENCE INTERVAL: C.I. =
STANDARD ERROR:
SAMPLE SIZE FOR A GIVEN m:
Z-SCORE:
ONE SAMPLE Z-TEST:
REGRESSION LI
HomeWorkQuestions(ChapterThree)
Note: You are allowed to use only a calculator in this homework
Q1 Below is the five-number summary of salaries (in $) for a sample of U.S. marketing
managers.
Min
4636
0
Q1
Median
69693
77020
Q3
Max
91750 129420
1. Would y
Math 251: Practice Questions Hints and Answers Part I. Questions from Chapters 13 I.A: Levels of Data, Types of Samples I.A.1. Categorize the following data according to level: nominal, ordinal, interval, or ratio. (a) Time of rst class. (b) Length of tim
Rules of Probability
Often, we want to compute the probability of an event from the known probabilities of other
events. This lesson covers some important rules that simplify those computations.
Definitions and Notation
Before discussing the rules of prob
Example: A Poker Hand
The game of poker has many variants. Common to all is the fact that players get - one way or
another - hands of five cards each. The hands are compared according to a predetermined
ranking system. Below, we shall evaluate probabiliti
Solutions to selected odd problems
Chapter 2
2.57
a. x = (4 + 2 + 1 + 0 + 1) / 5 = 1.6
Using Excel: =average(First cell:Last cell) or use Descriptive Statistics from
Tools/Data Analysis
2.67
a. Range = Maximum Minimum. Since Maximum = 13, and Minimum = 1