We want to test the hypothesis that mothers with low socio-economic status (SES) deliver babies whose birth weights are lower than "normal". To test this hypothesis, a list is obtained of birth weights from 120 consecutive, full-term, live-born deliveries from the maternity ward of a hospital in a low-SES area. The mean birth weight is x = 116.1 oz. with a standard deviation s = 18.8 oz. Nationwide, the mean birth weight in the United States is 120 oz. At = 0.05, does this sample provide significant evidence that the mean birth weight of babies born to mother with low SES is lower than "normal"?

a) p-value =0.0116.Reject H at the 5 percent level of significance. Conclude that the mean birth weight of babies born to low-SES mothers is lower than "normal".

b) p-value =0.0116.Reject H at the 1 percent level of significance. Conclude that the mean birth weight of babies born to low-SES mothers is lower than "normal".

c)p-value =0.0674.Do not reject H at the 5 percent level of significance. Conclude that the mean birth weight of babies born to low-SES mothers is not lower than "normal".

d)p-value =0.0674.Reject H at the 10 percent level of significance. Conclude that the mean birth weight of babies born to low-SES mothers is lower than "normal".