Question 1173063
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Hi, 
c=​0.99, x=12.3 ​, s=4.0​, n=6
ME ={{{ z*sigma/sqrt(n)}}}
c=​0.99 , df = 6-1 = 5     critical value t score = 4.03  (Using an online t-score Calculator)
ME = 4.03*4.0 /sqrt(6) = 6.58
Confidence Interval:
12.3-6.6 < u < 12.3 + 6.6
12.3-6.6 < u < 12.3 + 6.6
5.7 < u < 18.9
Generally the confidence interval limits is rounded to the same number of decimal places as the sample standard deviation
Wish You the Best in your Studies.