without a z table Sample size for estimating the population

[without a z table] Sample size for estimating the population mean

[without a z table] Sample size for estimating the population mean n = Imagine that z 0.11 According to the z table z is equal to 1.23. However how would you get to the same result, and express the value of z without the help of the table ?

Solution

Without the help of table, we can use excel function NORM.INV of 0.11, then we get -1.23. However we ignore the negative sign, since the normal distribution is symmetric.