knowh 6.a.) x ± 20/2 ° 0₁ = 8 = 29/2 b.) unknown- d) Write the confidence interval formula of 100(1 - a)% confidence inter population proportion p using sample with large size n and sample propor 7. Find 95% confidence interval for population mean μ, and (a) n = 50, 20, σ = 2; (b) n=50, x=-2, s = 3; (c) n = 10, x=3, s = 4 8. Find 99% confidence level for (d) n=50, = 20, σ = 2; (e) n=50, x=-2, s = 3; (f) n=10, = 3, s=4 (d) Compare the result of 7 and 8. What conclusion can you draw? 9. Find 90% confidence interval for nonulation proportion n if sample siz E