Question: based on the box plot and two sample t test attachments, is there credible evidence that the mean IQscore depends on birth order? Two-Sample T-Test

based on the box plot and two sample t test attachments, is there credible evidence that the mean IQscore depends on birth order?

Two-Sample T-Test and CI: IQ, Brthord Two-sample T for IQ Brthord N Mean St Dev SE Mean 1 10 100 . 4 14.5 4. 6 2 10 101.6 12.5 4.0 Difference = mu (1) - mu (2) Estimate for difference: -1. 20 95% CI for difference: (-13.99, 11.59) T-Test of difference = 0 (vs not =) : T-Value = -0.20 P-Value = 0. 845 DF = 17 Boxplots of IQ by Birth Order of Twins 130 120 110 100 90 80 2 BrthOrd

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