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Unformatted text preview: 2) Calculate t = (xbar 238 ) / (s / 100^.5) If Ho is true mu = 238, sampling distribution is t distributed with Df = n1 = 99 Sig. Level 3) Reject Rule 4) Tinv ( .1, 99 ) = 1.66 Calculations 5) xbar = 231 s = 80 t = 0.88 (231238)/(80/10) = 0.88 Pvalue = 0.1905 Tdist: ( .88, 99,1) = 0.19 Conclusion 6) Do not reject Ho Based on a sample of 100, with a sample mean of 231 and a sample standard deviation of 80, there is insufficent evidence to be able to conclude that the mean insurance benefits are less than $238 in Virginia Ho: 238 Ha: < 238 If Ho is true ( =$238), xbar is normal with (mean=$238 and std error = 80/100^.5) Alpha = .05 Reject Ho if xbar < 224.84 Ho: mu 238 Ha: mu < 238 Alpha = .05 Reject Ho if t < 1.66...
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 Spring '07
 Dunne

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