Question

QUIZ SEC 9.1 & 9.2 MATH 1401 NAME 9.1 Find confidence interval for the following population proportion. Many people think that a national lobby's successful fight against gun control legislation is reflecting the will of a minority of Americans. A random sample of 4000 citizens yielded 2250 who are in favor of gun control legislation. Estimate the true proportion of all Americans who are in favor of gun control legislation using a 98% confidence interval. Express the answer in the form p: E and round to the nearest ten-thousandth. A p-hat 2. Calculate the following formula: p(1-P) P 2a/2 USE: Critical Value Confidence Level (1-a)100% 22 1.645 90% 95% 99% 1.96 .025 .005 .01 .01 .02 2.575 98% 2.33

Answer 1

dp = n-1 = Sample size -1 Lecheria E 104 = 9. alpha (2) = o-1 [ (1-2)% =0.90] ophone e = 0.4 = 0.05 0.05 to - 2-262 Here oc=16, s=2.6 The 90% goc Confidence Interval, for mean is 14 3 teams and da 604 [ 16+ 1.9604] The confidence juterval (14.0396, 10.9604 is t o t