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Ahs Sara and math would like to know if the average length of hip-hop to nys, say e, differs than the average length of rap songs, suy M2. That in 41.7 M2 (a, the null and alternative hypotheses are Ho: M-M2=0 vs HaiM, - M₂ 70 So option and is corect. (6) Given that n = 50 m2, 3 = 245', S,=5, 2=275, 5256 The test statistic is X-X 245-275 =-27. 1607 S,² S22 25 36 + ni so n2 50 So t=-27.16 Let degrees of freedom be do. Then at d=0.05 and dofik=00, the chitical value is t (K) = 1.99 01 The critical value of the test is 1.99.
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