Why is it that the formula to tell that the sampling distribution of p hat will be approximately normal is np must be greater than or equal to  10 and n(1-p) is greater than or equal to 10? Why is it 10? Why not 20 or other numbers? What is the reason behind 10? Thanks!

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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Why is it that the formula to tell that the sampling distribution of p hat will be approximately normal is np must be greater than or equal to  10 and n(1-p) is greater than or equal to 10? Why is it 10? Why not 20 or other numbers? What is the reason behind 10? Thanks!

Shape
Let ô be the sample proportion of successes in a random sample of size n
selected from a population with proportion of successes p. Then, the
sampling distribution of ô will be approximately normal when
np ≥ 10 and n(1 − p) ≥ 10
For our example about students with driver's licenses, n = 50 and p = 0.3:
np = 50(0.3) = 15 ≥ 10 and
n(1 − p) = 50(1 – 0.3) = 35 ≥ 10
-
Therefore the distribution of p is approximately normal in this context.
Transcribed Image Text:Shape Let ô be the sample proportion of successes in a random sample of size n selected from a population with proportion of successes p. Then, the sampling distribution of ô will be approximately normal when np ≥ 10 and n(1 − p) ≥ 10 For our example about students with driver's licenses, n = 50 and p = 0.3: np = 50(0.3) = 15 ≥ 10 and n(1 − p) = 50(1 – 0.3) = 35 ≥ 10 - Therefore the distribution of p is approximately normal in this context.
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