need help wit c.

A sample mean, sample size, population standard deviation, and confidence level are provided. Use this information to complete parts (a) through (c) below. x =30. n=25. o =3. confidence level = 90% - . . . . c. Obtain the margin of error by using the formula E = z 8 IN In Identify the critical value. Z a =(Type an integer or decimal rounded to two decimal places as needed.) What is the margin of error obtained using the methods of parts (b) and (c)