t-tests - In-class exercise results

# t-tests - In-class exercise results - 1.268 pooled variance...

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Hypothesis Test: Independent Groups (t-test, pooled variance) Contractor A Contractor B 4,690.00 4,930.00 mean 2,799.38 3,008.89 std. dev. 10 10 n 18 df -240.000 difference (Contractor A - Contractor B) 8,445,000.000 pooled variance 2,906.028 pooled std. dev. 1,299.615 standard error of difference 0 hypothesized difference -0.18 t .8556 p-value (two-tailed) -2,970.390 confidence interval 95.% lower 2,490.390 confidence interval 95.% upper 2,730.390 margin of error Hypothesis Test: Paired Observations 0.000 hypothesized value 4,690.000 mean Contractor A 4,930.000 mean Contractor B -240.000 mean difference (Contractor A - Contractor B) 327.278 std. dev. 103.494 std. error 10 n 9 df -2.32 t .0456 p-value (two-tailed) -474.121 confidence interval 95.% lower -5.879 confidence interval 95.% upper 234.121 margin of error Hypothesis Test: Independent Groups (t-test, pooled variance) Topiramate Control 3.38 4.63 mean 0.92 1.30 std. dev. 8 8 n 14 df -1.250 difference (Topiramate - Control)

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Unformatted text preview: 1.268 pooled variance 1.126 pooled std. dev. 0.563 standard error of difference 0 hypothesized difference-2.22 t .0217 p-value (one-tailed, lower)-2.458 confidence interval 95.% lower-0.042 confidence interval 95.% upper 1.208 margin of error Regression Analysis r² 0.260 n 16 r 0.510 k 1 Std. Error 1.126 Dep. Var. Y ANOVA table Source SS df MS F p-value Regression 6.2500 1 6.2500 4.93 .0434 Residual 17.7500 14 1.2679 Total 24.0000 15 Regression output confidence interval variables coefficients std. error t (df=14) p-value 95% lower 95% upper Intercept 3.3750 0.3981 8.478 6.93E-07 2.5212 4.2288 Group 1.2500 0.5630 2.220 .0434 0.0425 2.4575 Contractor A Contractor B Topiramate Control 5500 6000 3 1000 900 3 2500 2500 2 7800 8300 4 6400 6200 3 8800 9400 4 600 500 3 3300 3500 5 4500 5200 6500 6800 Group 3 3 2 4 3 4 3 5 1 3 1 3 1 5 1 5 1 7 1 5 1 5 1 4...
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