Rhianna and Myra, both teachers, are adding books to their class libraries. Rhianna's classroom started out with a collection of
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Answer: 12
Step-by-step explanation:
The formula to find the sample size is given by:-
, where
is the population standard deviation,
is the z-value for the
confidence interval and E is the margin of error .
As per given , we have
Population standard deviation :
z-value for 95% confidence interval :
Margin of error : E= 3
Then, the required minimum sample :-
Hence, the required minimum sample size = 12