Answer: 1024
Step-by-step explanation:
Formula to find the standard error :
[tex]se=\dfrac{\sigma}{\sqrt{n}}[/tex]
We are given that , [tex]\sigma=0.8[/tex]
se=0.0025
Substitute theses values in the above formula , we get
[tex]0.0025=\dfrac{0.8}{\sqrt{n}}[/tex]
[tex]\Rightarrow\ \sqrt{n}=\dfrac{0.8}{0.025}=32[/tex]
Squaring both sides , we get
[tex]n=(32)^2=1024[/tex]
Hence, they sampled 1024 employees.
