(a – b)2 = (a – b)(a – b) = a2 – 2ab + b2
2 answers:
You might be interested in
Answer:
And the 95% confidence interval would be between (69.027;80.793)
Step-by-step explanation:
Information given
represent the sample mean
population mean (variable of interest)
represent the population standard deviation
n=33 represent the sample size
Confidence interval
The confidence interval for the mean is given by the following formula:
(1)
The degrees of freedom are given by:
The Confidence level is 0.99 or 99%, the significance would be and
, the critical value for this case would be
And replacing we got:
And the 95% confidence interval would be between (69.027;80.793)