Normal provability curve is one of the important topic in the Educational research.The theory of parametric tests in the inferential statistics is completely based on the NPC. Every researcher must know the characteristics of the NPC.
Rating scale is defined as a closed-ended survey question used to represent respondent feedback in a comparative form for specific particular features/products/services. It is one of the most established question types for online and offline surveys where survey respondents are expected to rate an attribute or feature
Normal provability curve is one of the important topic in the Educational research.The theory of parametric tests in the inferential statistics is completely based on the NPC. Every researcher must know the characteristics of the NPC.
Rating scale is defined as a closed-ended survey question used to represent respondent feedback in a comparative form for specific particular features/products/services. It is one of the most established question types for online and offline surveys where survey respondents are expected to rate an attribute or feature
A pilot study as on experimental exploratory, test , preliminary , trial or try out investigation.
A trial study carried out before a research design is finalized to assist in defining the research questions or to test the feasibility, reliability and validity of proposed study design.
A small scale study conducted to test the plan and method of a research study.
Education is the process of facilitating learning, or the acquisition of knowledge, skills, values, morals, beliefs, and habits. Educational methods include teaching, training, storytelling, discussion and directed research.
Observation Method is one of the methods for data collection. This method is very much applicable for ethnic research. Expert data collectors are essential to collect data through observation method..
A pilot study as on experimental exploratory, test , preliminary , trial or try out investigation.
A trial study carried out before a research design is finalized to assist in defining the research questions or to test the feasibility, reliability and validity of proposed study design.
A small scale study conducted to test the plan and method of a research study.
Education is the process of facilitating learning, or the acquisition of knowledge, skills, values, morals, beliefs, and habits. Educational methods include teaching, training, storytelling, discussion and directed research.
Observation Method is one of the methods for data collection. This method is very much applicable for ethnic research. Expert data collectors are essential to collect data through observation method..
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Chapter 6: Normal Probability Distribution
6.1: The Standard Normal Distribution
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2. Marquis De Laplace and Karl Friedrich
Gauss derived the normal probability curve
independently, so the curve is also known
as Gaussian curve in the honour of Gauss.
3. • NPC is The frequency polygon of any normal distribution
• The bell shaped figure & a graph representing a
distribution of scores is called the Normal Probability
Curve or simply The Normal curve.
4. • Smooth bell shaped
curve
• Asymptotic:
approaching the X-
axis but never
touches it.
• Symmetric: made up
of exactly similar
parts facing each
other.
• Zero Skewness
• Kurtosis=0.263
5. • All the three central tendencies are equal
(mean=median=mode) or concentrate on
one point.
• Represented by 0 along The baseline.
• It is an Unimodal curve.
• The Normal Curve ranges from -3σ to +
3σ or 6σ.
• The Mean of the normal distribution is
zero. S.D is equal to One.
6.
7. • It covers total 10,000 cases.
The first & The third Quartile(Q1&Q3) are at
equal distance from Q2 or median.
9. • Converting raw score into comparable
standard normalized scores.
• Comparing the achievement in different
subjects.
• To determine the percentage of cases in a
normal distribution within given limits.
• To determine The relative difficulty value of
The test items.
10. Given a normal distribution, N=800,
Mean=80 & SD=16.
To find The standard score for The raw
score 40 for The given distribution.
Z=X-Mσ
Z=Value of z scores
X = Value of raw scores
M= Mean of scores
σ = S.D
12. • A) To find the percentage of cases
below a given score point.
• B) To find the percentage of cases
above a given score point.
• C) To find the percentage of cases
lying between two given score points.
15. • In a sample of N=1000, Mean=80 &
SD=16. Find The total number of
individuals whose lie below the score point
48.
• Z=?
• X=48
• σ =16
• M=80
Z=X-M/σ
=48-80/16
= -2σ
16. 32 48 64 80 96 112 128
34.1
3%
13.
59
%
47.72%
100=2.27
1000=2.27*1000/1
00
22.7 individuals
23 individuals
Out of 1000, 23 individuals achieve score
below the score point 48.
2.27% of cases will lie below The score
point 48.
50-
47.72
2.27%
17. • A student obtain 80 marks in Math and 50 marks in
English. Find out in which he did better, if it is given that.
Maths Z=X-Mσ =80-70/20 = 10/20 =0.5σ
English Z=X-Mσ = 50-30/10 = 20/10 = 2σ
0.5<2σ
Math
Engli
sh
Mean 70 30
S.D 20 10
18. • In Research Work
• Measurement and Test construction
• In statistical treatment
• In administration
• In developing norms
• Test items Difficulty Value
• Comparison of two Distribution
