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# Data Analysis

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on 25 October 2013

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#### Transcript of Data Analysis

Data Analysis
Data analysis is performed using the data matrix which is stored in a file
Procedure to analyze data
Procedures to analyze data
Data analysis is performed by computer.

- Substantial amount of information / data

-Computer system to file and analyze data
The way we have formulated the hypothesis
Measure the level of the variables
The researcher's interest
Data analysis depends on three factors
The main analysis
-Descriptive statistics for the variables
-Ratings "Z"
-Reasons and Rates
-Parametric tests
-Nonparametric test
-Multivariate analysis
Descriptive statistics for each variable
Describes the data, values or scores
for each variables using a
questionnaire to
a determined number of people.
Frequence distribution
It is an ordered set of scores in their respective categories. It can be in the form of graphs.
Measures of central tendency
Points in a distribution or core
values that help us to locate within
the measurement range
Mode
It is the category or score that
occurs most frequently. It is
used with any measurement.

Median
It is the value that divides the distribution in half. It reflects the intermediate position of the distribution.
2
N
+
1
formula
=
24 31 35 35
38
43 45 50 57
median
Mean
It is the sum of all values divided by the number of cases.
symbol "X".
X =
X
X
X
X
1
2
3
4
+
+
+
N
formula
Range
it is the difference between the highest score and the lowest score
formula XM - Xm
17 18 20 20 24 28 28 30 33

33-17=
16
Range
9+1
2
=
5
Standard deviation
It is the average of the deviation of the scores respect to the mean.
Symbol "S"
Variance
Standard deviation is squared
Symbol "S
2
"
Ratings "Z"
It is used to compare the pre-test
score with another score on a post-test
Formula
Z = X - X
S
-
-
-
Inferential statistic
It is based on sampling and
averaging for research
Sampling distribution
It is a set of values that
has been calculated
for all the
possible samples

Level of significance
The research has a 95% chance of being safe according to the sampling done
thank you
!
!
!
It can be used
to test hypothesis
Make decisions regarding the analysis to be performed
Elaboration of
a program
analysis
Running the computer program
Obtaining analysis
Data codes
The main purpose of the researcher is to describe data of each variables and compare between them.
Categories
Frequence
AMT
lEM
FGI
HML
1
2
3
4
50
88
12
3
Codes
Measures of variability
Values in a distribution
Full transcript