Answer:
( 11.7 , 12.7 )
Step-by-step explanation:
The provided information is:
Sample mean =
Standard deviation =
Sample size = n = 49
Significance level =
Thus, the 95% confidence interval is:
It is given in the question that
And the given expression is
Substituting the values of a,b and c, we will get
So with the given values of a,b and c, we will get
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The answer is <span>20.3896551724</span>
The answer is D. Tell me if this works.