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Bio stats March 16

# Bio stats March 16 - slide 27 chapter 7 p hat = 17/987 =...

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slide 27 chapter 7 p hat = 17/987 = 0.017 slide 28 99 percert CI = 1-2 = .99 = alpha/2 = .005 z* = Z alpha/2 = Z.005 = 2.58 99% Confindence interval = (p hat +or- Z* (square root of p hat (1- p hat)/ n) n= 987 and p hat = .017 so 0.017 plus or minus 2.58 x (square root 0.017 (1-0.017)/987)) = 0.017 plus or minus 0.011 = .006 , .0028 smaller number left bigger number to the right we are 99 percent confident that the true pop perportion falls between .006 and .0028 Slide 30: x bar is a sample mean, must know sigma to use this formula slide 31 population distrubition x follows N ( meuw, sigma) N stands for normal population.. then x bar follow N (meuw, sigma/ square root of n) if X is not Normal then By Central limit therom n is greater then 30 then x bar = N (meuw x . sigma x/ squeare root of n). x bar means Slide 32 important that is normal with stardanrd deviation Slide 33 : 90 percent CI 1- alpha = .90 then alpha/2 = .05 Z* = Z.05 = 1.645 n =10 sigma = 3 xbar = 23.3 + 27.9 + 26.1 /10= 90% CI= xbar plus or minus Z.05 x( 6/sq root of n) = 25.36 plus or minus 1.645 x (3 / squeare root of 10)= 25.36 plus or minues 1.56 = (23.8, 26.92) must integrate we are 90 percent confindent that the true av miles per gallon is bt

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Bio stats March 16 - slide 27 chapter 7 p hat = 17/987 =...

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