Based on a large sample of capacitors of a certain type, a 95% confidence interval for the mean capacitance, in µF, was computed to be (0.213, 0.241). Find a 90% confidence interval for the mean capacitance of this type of capacitor.
What will be an ideal response?
The sample mean 
is the midpoint of the interval, so =0.227 . The upper confidence bound 0.241 satisfies .
Therefore 
. A 90% confidence interval is 
.
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