1. A study was conducted of pregnant women who smoked and those who did not smoke, to see if maternal smoking had an effect on the birth weight. at the .05 level, test the claim that maternal smoking can lower the bitht weight of a child. Assume the variances to be equal. Smokers - n1=10, X1=6.9, s1=.5 and non smokers - n2=10, x2=7.2, s2=.4
2. students were paired by matching their iqs and grades in previous mathematics courses taken. group A attended lecture and dd homework. Group B watched videos and did work on a computer. Test to see if there is a significant difference in the final exam scores for the two groups at the .05 level.

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