STATS: Does cocaine use by pregnant women cause their babies to have low birth weight?

Question by Effy Stone: STATS: Does cocaine use by pregnant women cause their babies to have low birth weight?
Does cocaine use by pregnant women cause their babies to have low birth weight?

To study this question, birth weights of babies of women who tested positive for cocaine/crack during a drug-screening test were compared with the birth weights for babies whose mothers either tested negative or were not tested, a group we call “other”

Here are the summary statistics. The birth weight s are measured in grams.

Positive Test Group:
N = 134
Sample Mean = 2733
Standard deviation s = 599

Other Group:
N = 5974
Sample Mean = 3118
Sample Mean = 2733
Standard deviation s = 672

1. Formulate appropriate null and alternative hypotheses.
(M1 – the mean birth weight of babies of woman who tested positive,
M2 – the mean birth weight of babies of woman who either tested negative or were not tested)

2. Find the value of the test statistic. Assume that the standard deviation for both populations is the same and use the pooled variance.

3. Find the P-value of the test.

4. Does the cocaine use by pregnant women cause their babies to have low birth weight?

Best answer:

Answer by Missy
yesss they do

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