10.8 Test 1 Computer Practice

10.8 Test 1 Computer Practice - 5 yr weight 30.5 37 42 45.5...

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Unformatted text preview: 5 yr weight 30.5 37 42 45.5 36 29.4 36.5 38.5 39 40 28.5 45.5 35 32 33 30.5 38 37 42 49 29 A. Is the variance of weight of 5 yr old boys more than 30 lbs sqaured? Use a 5% significance level. Test and CI for One Variance: 5 yr weight Statistics Method Variable N StDev Variance 5 yr weight 21 5.83 34.0 Null hypothesis Sigma-­‐squared = 30 Alternative hypothesis Sigma-­‐squared > 30 The chi-­‐square method is only for the normal distribution. The Bonett method is for any continuous distribution. B. Construct a 90% confidence interval for the standard deviation of the weights of 5 yr old boys. 90% Confidence Intervals 90% Confidence Intervals CI for CI for Variable Method StDev Variance 5 yr weight Chi-­‐Square (4.65, 7.91) (21.6, 62.6) Bonett (4.74, 7.77) (22.5, 60.3) 4.65, 7.91 Use a 5% significance level. Variable N StDev Variance 5 yr weight 21 5.83 34.0 he weights of 5 yr old boys. Tests Test Variable Method Statistic DF P-­‐Value 5 yr weight Chi-­‐Square 22.64 20 0.307 Bonett — — 0.299 ...
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