Find the sample size necessary to estimate the mean iq score of statistics students such that it can be said with 99% confidence that the sample mean is plus or minus8 iq points of the true mean. assume that the standard deviation is 13 and determine the required sample size. nequals nothing (round up to the nearest integer.)

18

Step-by-step explanation:

The formula to find the minimum sample size is given by :_

, where = population standard deviation.

z*= critical z-value.

E= Margin of error.

Given :

E= ± 8

We know that critical value corresponding to 99% confidence level = z*=2.576  [Using z-table]

Then, the required sample size would be :

[Round to next integer.]

Hence, the required minimum sample size = 18

in simplified version   it would be x ≤-4

step-by-step explanation:

multiply each term in x ≤-4 by -1