The following is for questions 2, 3 and 4:

Not much is known about the use of cannabis while pregnant because for obvious reasons, expecting mothers cannot be randomly assigned to use or not use this drug while pregnant. In samples of mothers in the US who do use cannabis, the comparison is usually flawed because the samples have other important differences, namely that the mothers who use are often also poor. In a first study of it's kind, a researcher matched mothers who did and did not use cannabis so that each pair had a very similar economic status.

Question 2 of 7

Question2

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Given the design of the study and the question of interest, which of the following 4 computer outputs is relevant to use

Paired T-Test and CI Sample N Mean StDev SE Mean Marijuana Use 10 70.6 23. 4 7.4 No Marijuana Use 10 78 .0 17.4 5.5 Difference 10 -0. 43 11.83 3.74 954 lower bound for mean difference: -7.29 T-Test of mean difference = 0 (vs > 0) : T-Value = -0.11 P-Value = 0.544Paired T-Test and CI Sample N Mean StDev SE Mean Marijuana Use 10 77.59 23.38 7.39 No Marijuana Use 10 78. 02 17.36 5.49 Difference 10 -0.43 11.83 3.74 954 upper bound for mean difference: 6.43 I-Test of mean difference = 0 (vs