Question

Translate the statement into a confidence interval. Approximate the level of confidence In a survey of 1038 adults in a country, 77% said being able to speak the language is at the core of national identity. The survey's margin of error is +3.8% The confidence interval for the proportion is (0.732.0.808) (Round to three decimal places as needed.) The interval is a % confidence interval. (Round to one decimal place as needed.)

Answer 1

Part a) is correct so, I am solving part(b)

0.038 - Zala b we know E = Zah PCI-å n so 0.77 0.23 1038 Zah = 0.038 1038 0.77X0.23 2.91 using Excel Juz (1-92)= NORMS DIST (2.91) (1-02)= 0.998 az = 0.002 > a: 0.004 100 (1-0)% = 99.6% forsvar