Question

Find z_α/2 for each of the following confidence levels used in estimating the population proportion.

Round your answers to 3 decimal places.)

		zα/2
a.	90%
b.	98%
c.	85%
d.	95%
e.	99%

Answer 1

Solution :- given that, is a) At 90% confidence level the z 2:1 - 90% <= 1-0.90 soil 42 = 0.05 242 = 20.05 = 1.645 24 - 1.645 the z is b) At 98% confidence level x=1-98% x = - 0.98 = 0.02 42=0.01 Z22 = 20.01 = 2.326 242 = 2.326 is c) At 85% confidence level the z 21-85°). co) - 0.85 x = 0.15 42=0.075 262 = 20.075= 1.440 222 = 1.440

Date is d. At 95% confidence level the 2 Kel-95 x= 1-0.95 x = 0.05 42 = 0,025 Z42 = 20.025 = 1.960 242= 1.960 is At 99% confidence level the z 21-99°%. x=1-o.gg x = 0.01 212= 0.005 2222 = 20.005= 2.576 242 = 2.576 ZH2 1.645 gol. 98% 2.326 85% 95'). 99% 1.440 1.960 2.576