Statistics - Confidence Interval.

The following random sample from a population whose values were normally distributed was collected.

10 8 11 11

The 95% confidence interval for m is
a) 8.52 to 10.98
b) 7.75 to 11.75
c) 9.75 to 10.75
d) 8.00 to 10.00

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... =sqrt[ sum(d^2) /(n - 1)] = sqrt(6/3) = sqrt 2

SE = SD/sqrt n = sqrt 2 / sqrt 4 = 0.7071

Degrees of freedom ...