example_2t

# example_2t - assuming equal variances t =-4.1382 P-value =...

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Stat 2225 Handout Inference for Two Independent Populations Q13.39 on p.410 Summary Statistics Drug Exercise ------------------------------------------------------------ Count 25 25 Average 9.92 13.52 Variance 13.16 5.76 Standard deviation 3.62767 2.4 Minimum 4.0 7.0 Maximum 16.0 19.0 ------------------------------------------------------------ Comparison of Means ------------------- 95.0% confidence interval for mean of Drug: 9.92 +/- 1.49743 [8.42257,11.4174] 95.0% confidence interval for mean of Exercise: 13.52 +/- 0.990673 [12.5293,14.5107] 95.0% confidence interval for the difference between the means assuming equal variances: -3.6 +/- 1.74914 [-5.34914,-1.85086] t test to compare means Null hypothesis: mean1 = mean2 Alt. hypothesis: mean1 NE mean2
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Unformatted text preview: assuming equal variances: t = -4.1382 P-value = 0.000140376 Comparison of Means ------------------- 95.0% confidence interval for mean of Drug: 9.92 +/- 1.49743 [8.42257,11.4174] 95.0% confidence interval for mean of Exercise: 13.52 +/- 0.990673 [12.5293,14.5107] 95.0% confidence interval for the difference between the means not assuming equal variances: -3.6 +/- 1.75608 [-5.35608,-1.84392] t test to compare means Null hypothesis: mean1 = mean2 Alt. hypothesis: mean1 NE mean2 not assuming equal variances: t = -4.1382 P-value = 0.00016653 Histogram and Density Trace: Drug Exercise frequency 4 8 12 16 20 10 6 2 2 6 10 Variable Drug Exerci Density Traces 4 8 12 16 20 0.03 0.06 0.09 0.12 0.15 density...
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