: . . . 3. at 18 thy Quot-lent of 1,000 ~ ., . ‘ : - - '2; iv . 44 a mm fl ‘ 4'. a '3 ,. -, . ,. , . 3' k , it ’ » ' ' ‘ ‘ V . .
‘ I ‘ v , . _ » I , ‘ I , ., - a > V . .. ‘ V v " . I L I .4; " I 7 ‘ ’ i mm mm . ‘ ' > ’ ” ' ‘ V " ‘ a f . 7 a ‘
1 answer:
You might be interested in
Answer:
And we are 95% confident that the true mean of chloride concentration is between 0.375 and 0.377 cc/ cubic meter
Step-by-step explanation:
Data provided
represent the sample mean for the chloride concentration
population mean (variable of interest)
s=0.0012 represent the sample standard deviation
n=15 represent the sample size
Confidence interval
The confidence interval for the mean is given by the following formula:
(1)
Since we need to find the critical value first we need to begin finding the degreed of freedom
The Confidence is 0.95 or 95%, the significance would be and
, and the critical value for this case with a t distribution with 14 degrees of freedom is
And the confidence interval is:
And we are 95% confident that the true mean of chloride concentration is between 0.375 and 0.377 cc/ cubic meter