Solution:
Given
n= 218 sample size
hg sample mean
s = 6.2 hg sample standard deviations
level of significance
The 98% confidence interval for population mean is
Here n> 30 converges to
Used value of .
At
From Z table
( 32.72159, 34.678406)
( 32.7, 34.7)
The 98% confidence interval for population mean is
The results between two confidence are not different .
Because the confidence limits are similar.
Option B is correct.
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