What is the p value ?
What is the p value ?
Note: As per the requirement solving
From the available information,
The observed frequency for the number of low birth weight births a 35 to 39 year old mother is, 30.
The total number of births is given as 280.
The observed frequency for the number of births to mothers 35 to 39 year old that are not low birth mother is,
(The total number of births) - (the number of low birth weight births a 35 to 39 year old mother is)
= 280-30
= 250
Given that , the proportion of babies with low birth weight is,
p = 7.1%= 7.1/100=0.071
The expected frequency for the number of low birth weight births a 35 to 39 year old mother is,
n*p = 280*(0.071)= 19.88
The expected frequency for the number of births to mothers 35 to 39 year old that are not low birth mother is,
n*(1-p)=280*(1-0.071)
=280*(0.929)
=260.12
| Observed frequency (O) |
Expected frequency (E) |
(O-E) | (O-E)^2 | (O-E)^2/E |
| 30 | 19.88 | 10.12 | 102.4144 | 5.15163 |
| 250 | 260.12 | -10.12 | 102.4144 | 0.39372 |
| Sum:280 | 5.54535 |
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