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Choose from the following questions:

Confidence Intervals for estimating the Population Mean µ

In each problem assume a normal distribution.

Compute the following:

a) The Critical Value z* or t* whichever applies.

b) The Margin of Error.

c) The Confidence Interval

Confidence Interval:  X‾ ± ME

Normal:   ME = z*(σ/√n)

t-distribution:  ME = t*(s/√n), with df = n-1 

 

 

8. Data: Sample size: n =64, sample mean: x‾ =23,228, σ =8779. Confidence 92%

 

9. Data: Sample size: n = 31, sample mean: x‾ = 134.5, s =3.48. Confidence 95%