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H1: z-Test: Two Sample for Means X Group Not X Group Mean 6.1575 4.5325 Known Variance 4.41 9 Observations 40 40 Hypothesized Mean Difference 0

H1: z-Test: Two Sample for Means X Group Not X Group Mean 6.1575 4.5325 Known Variance 4.41 9 Observations 40 40 Hypothesized Mean Difference 0 Z 2.806525367 P(Z

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