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t <br />t = 33.2 - 28_9 <br />16.6 1/12 ~ 1/I2 <br />t=4.3 <br />16.6 .08 t .08 <br />t=4.3 <br />16.6 (.4) <br />t = 4.3 <br />10.64 <br />t = .40 <br />On basis of .t tailed test at .05 level of significance <br />we can acce~ Ho if t is between - 2.07 to 2.07 for (12+12-2) = 22 <br />degrees of freedom. Thsu we conclude there is no significant <br />difference a, 957 confidence level. <br />