Answer: The estimated margin of error = 0.5 centimeter
The sample mean = 4.3 centimeters
Step-by-step explanation:
The confidence interval for population mean is given by :-
or
, where = sample mean.
E = Margin of error .
The given confidence interval : (3.8,4.8 )
Lower limit : (1)
Upper limit = (2)
Eliminate equation (1) from (2) , we get
⇒ The estimated margin of error = 0.5 centimeter
Add (1) and (2) ,we get
⇒ The sample mean = 4.3 centimeters
