The estimate of the population proportion should be within plus or minus 0.02, with a 90% level of confidence. The best estimate of the population proportion is 0.16. How large a sample is required

The sample size required is 910.

Step-by-step explanation:

The confidence interval for population proportion is:

The margin of error is:

Given:

The critical value of z for 90% confidence level is:

*Use a standard normal table.

Compute the sample size required as follows:

Thus, the sample size required is 910.

341

step-by-step explanation:

all you have to do is 9x31 (which equals 279) and then 20x31 (which equals 620). then you have to subtract. 620-279=341.

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|