Q-Mart is interested in comparing its male and female customers. Q-Mart would like to know if
the amount of money spent by its female charge customers differs, on average, from the amount
spent by its male charge customers.
To answer this question, an ana
Normal
Distribution
Normalization Distribution
Thenormal
distributionrefers
to
a
family
ofcontinuous probability distributionsdescribed by
the normal equation.
Normal equation.The
variableYis:
value
of
the
random
Y = cfw_ 1/[ * sqrt(2) ] * e-(x - )2/22
w
The form of the alternative hypothesis can be:
A.one or two-tailed
Question 2 of 20
1.0/ 1.0 Points
A manufacturer of flashlight batteries took a sample of 13 batteries from a days production and
used them continuously until they failed to work. The life
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
Accepted characters:
Senior management of a consulting services firm is concerned about a growing decline in the
firms weekly number of billable hours. The firm expects each professional employee to spend
at least 40 hours per week on work. In an effort t
Selecting Appropriate Inferential Statistical Techniques
To begin our conversation about inferential statistics, the first step is to develop the ability to determine the
appropriate statistical technique to various situations. This decision that is a fun
The Christian Respondent
Misuse of Statistics and Quotations by the Watchtower Society
( Number 44. Originally published June 21, 1988 )
The April 8, 1988 Awake! magazine addresses itself
to the question: "Are We in the Last Days?" Not
surprisingly, it co
Question 1 of 20
1.0/ 1.0 Points
If one tosses a coin enough times, the proportion of "heads" will approach 0.5. This is an
example of:
B.the Law of Large Numbers
Question 2 of 20
1.0/ 1.0 Points
If P(A) = P(A|B), then events A and B are said to be
C.inde
Lab 1: Introduction to R & RStudio
Exercise 1: What command would you use to extract just the counts of girls baptized?
arbuthnot$girls
Exercise 2: Is there an apparent trend in the number of girls baptized over the years? How would you
describe it?
Over
R Studio 2
Lab 1: Distributions
Exercise 1: Make a histogram of mens heights and a histogram of womens heights. How would you compare
the various aspects of the two distributions?
Both histograms appear to be distributed similarly. Men have a higher mean
R Studio 3
Lab 1: Inference for Numerical Data
Exercise 1: What are the cases in this data set? How many cases are there in our sample?
The cases are the relations between the births of children in North Carolina and the habits of their expectant
mothers.
Chapter 1:
Statistics is the science of collecting, organizing, and analyzing the data.
Data is the fact or pieces of information.
Descriptive Statistics consists of methods for organizing and summarizing information. Descriptive
statistics includes the c
14.5 comparing three or more populations: completely randomized design
Nonparametric method can used to analyze the data from CRD.
Kruskal-Wallis H-test for CRD: no assumptions concerning the
population probability distribution.
Rank Procedure:
1. Rank
Chapter 14
Nonparametric Statistics
Introduction: Distribution-Free
Tests
Distribution-free tests statistical tests
that dont rely on assumptions about the
probability distribution of the sampled
population
Nonparametrics branch of inferential
statistics
14.7 Rank Correlation
In chapter 11, we have introduced a correlation coefficient r based on the observations of
two numerical variables.
Here we introduce a correlation coefficient based on ranks of observations:
Spearmans rank correlation coefficient rs
14.6 Comparing three or more populations: randomized Block design
Friedman Fr -test for RBD: no assumptions concerning the population probability
distribution.
Rank procedure:
1. Rank observations within each block;
2. Add up the ranks for each treatment
Chapter14 Nonparametric Statistics
Introduction:
Parametric statistical tests: methods for making inferences about population parameters
(confidence interval and hypothesis testing) rely on the assumptions about probability
distribution of sampled populat
Unit2:Basics:DataDescription
Leo'sDataMine
DescribingandSummarizingData
Working with Data
Histograms
Outliers
Summary
Creating Histograms in Excel
Central Values for Data
The Mean
The Median
The Mode
Summary
Finding The Mean In Excel
Finding The Median In