It is known that the population variance equals 484. with a.95 probability, the sample size that needs to be taken to estimate the population mean if the desired margin of error is 10 or less is

Solution: We are given:

Population variance,

Margin of error,

The formula for determining the required sample size is:

Where:

is the critical value at 0.05 significance level

Therefore the required sample size is 19

a

step-by-step explanation:

when a number is between two straight lines it means the absolute value.

to find absolute value you need to know how many numbers is that number away from 0.

when finding absolute value the number will always come out positive

so absolute value of -3 is 3

absolute value of 3/2 is 3/2

absolute value of -2 is 2

absolute value of 3.5 is 3.5

absolute value of -1 is 1

now put these numbers in order:

a)   |-1|, |3/2|, |-2|, |-3|, |3.5|

0.85% : )

step-by-step explanation: