Dear Viv,
I cannot understand your question
clearly. So I am trying to answer your second query.
<< What is the
fundamental difference between
probalility distruibutions and frequency distributions?>>
Probability distribution: Values of random variable with corresponding
probabilities
Frequency distribution: Values of random variable with corresponding
frequencies.
Example: Let X
be a random variable. Also assume that x
is a particular value of X and f(x) and p(x)
be the frequency (of x) and
probability (that X takes value x) respectively. That means,
p(X=x) =Probability (X=x)
f(x)= Frequency of x
x
f(x) p(x)
--------------------------
0
2
2/10=0.2
1
1
1/10=0.1
2
3
3/10=0.3
3
0
0/10=0.0
4
4
4/10=0.4
-------
------- --------
Total 10
1.0
Here {x,
f(x)} will be known as frequency
distribution of random variable X
Whereas {x, p(x)} will
be known as probability distribution of random variable X
Hope it helps.
Regards,
MADAN
From:
Sent: 18 September 2006 11:06
To:
Subject: [Statisticians_group]
Confusion!!
I am new to stats and have a couple basic questions regarding
sampling , the central limit theorem and probability.
If the sample size is 30 or greater then the sample means follow a
normal distribution.I wanted to know the minimum size of the
observations in each sample and its limits. Can I take 30 samples
each having 2 observations with the knowledge that the means of
these samples would follow a normal distribution?
Also I would like to get an intuition about probability
distributions. What is the fundamental difference between
probalility distruibutions and frequency distributions?
Can anyone please let me know about these as I am not able to
progress much without getting my basics clear :-)
Thanks
Viv
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