DS123_Lab_5

DS123_Lab_5 - t-Test: Two-Sample Assuming Equal Variances...

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t-Test: Two-Sample Assuming Equal Variances
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Bradley Dorn Set right and left margins to 0.5''' (under File-Page Setup). Lab 5, DS 123 Set coumn width for Column C to 2, for Column D to 25. 3/12/08/3:30pm Set cell D22 on right-justified text. Question 1. t-Test:Two-Sample Assuming Equal Variances New Bat Old Bat New Bat Old Bat 3.3 4.2 Mean 5.1 4.23 6.4 2.9 Variance 1.59 0.68 3.9 4.5 Observations 8 8 5.4 4.9 Pooled Variance 1.14 5.1 5 Hypothesized Mean Difference 0 4.6 5.1 df 14 4.9 3.2 t Stat 1.64 7.2 4 P(T<=t) one-tail 0.06 t Critical one-tail 1.76 P(T<=t) two-tail 0.12 t Critical two-tail 2.14 Hypothesis Test, t: Hypothesis Test, p-Value: H0:mu1NEW - muOLD >=0 H0:mu1NEW - muOLD >=0 H1: mu1NEW -muOLD < 0 H1: mu1NEW -muOLD < 0 II. Rejection Region: II. Rejection Region: alpha = 0.05 alpha = 0.05 Critical t value: Decision rule: 2.14 if p-Value < 0.05, rej H0. Decision rule:
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This note was uploaded on 04/18/2008 for the course DS 123 taught by Professor Taylor during the Spring '08 term at CSU Fresno.

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DS123_Lab_5 - t-Test: Two-Sample Assuming Equal Variances...

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