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t-Test: Two-Sample Assuming Unequal Variances R&D Sales Mean 3.155922039 3.147260274 Variance 0.13180797 0.126006214 Observations 667 292 Hypothesized Mean Difference 0 df 567 t Stat 0.35

t-Test: Two-Sample Assuming Unequal Variances R&D Sales Mean 3.155922039 3.147260274 Variance 0.13180797 0.126006214 Observations 667 292 Hypothesized Mean Difference 0 df 567 t Stat 0.35 P(T

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