To calculate a 99 confidence interval the value z in the mar

To calculate a 99% confidence interval, the value z* in the margin of error should equal:

2.576

1.645

2.33

1.96

Solution

Margin of Error = Z a/2 * (sd/ Sqrt(n))
Where,
x = Mean
sd = Standard Deviation
a = 1 - (Confidence Level/100)
Za/2 = Z-table value

Z a/2= 2.576