Confidence Interval to SolutionConfidence Interval CI x t

Confidence Interval ________ to ________ .

Confidence Interval
CI = x t a/2 * (sd/ Sqrt(n))
Where,
    x    = Mean
    sd   = Standard Deviation
    a    = 1 - (Confidence Level/100)
    ta/2 = t-table value
    CI   = Confidence Interval
Mean(x)=50.08
Standard deviation( sd )=20.25
Sample Size(n)=30
Confidence Interval = [ 50.08 t a/2 ( 20.25/ Sqrt ( 30) ) ]
= [ 50.08 - 1.699 * (3.7) , 50.08 + 1.699 * (3.7) ]
= [ 43.8,56.36 ]