Find the critical range value from the given data. I think the t statistic is ri

Question

Find the critical range value from the given data.

I think the t statistic is right. I know I need to use a t table but its been a while since I took stats, so I can't remember how to do it.

(x, R)P Fire bush % Herbivory (x) Sample 6.78 2.06 2.44 5.30 6.79 1.73 12.16 1.42 4.55 0.32 x = 4.355 2.425 2.295 1.915 0.945 2.435 2.625 7.805 2.935 0.195 4.035 5.880625 5.267025 3.667225 0.893025 5.929225 6.890625 60.918025 8.614225 0.038025 16.281225 = 114.37925 2 4 6 8 9 10 Standard Deviation (S) = 3.56494117 Variance (S2) = 12.70880554

Explanation / Answer

The given formula is the t test for comparing two means from independent population with unequal variances.

The degrees of freedom is smaller of (n1-1) and (n2-1) = 9

The critical value of t for two tailed tests at 5% level of siginificance is =+/- 2.2622

The critical value of t for one tailed test at 5% level of significance is = 1.8331

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