Question

Random sample of 143 girl and 127 boys were selected from a large population.A measurement was taken of the haemoglobin level(measured in g/dl) of each child with the following result.
Estimate the standard error of the difference between the sample means?​

Answer 1

Answer:

0.168

Step-by-step explanation:

Answer 2

Answer:

0.166

Step-by-step explanation:

We need to calculate Standard Deviation,

Standard Deviation=$\sqrt{(s.d)*2/n$

But for both girls and boys total error can be added,

Total Standard error=Standard error1+Standard error2

                 =$\sqrt{(s.d1*2)/n1$+$\sqrt{s.d2*2)/n2$

                 =$\sqrt{(1.41*2)/143$+$\sqrt{(1.32*2)/127$

Total standard error =0.166

#SPJ3