Question

Find the margin of error for the given values of​ c, σ​, and n.

c=0.90​, σ=3.3, n=81.

Eequals= _ (Round to three decimal places as​ needed.)

Answer 1

We know that :-

Margin of error = Critical value Standard error of the sample

Standard error of the sample = = = 0.3667

Critical value = Z_/2

According to the problem : 1- = 0.90 =0.1 /2 = 0.05

  Critical value = Z_/2 = Z_0.05 = 1.645

Thus;

Margin of error = 1.645 0.3667 = 0.6031667