A recent study revealed that the average weight of babies born in the United States is normally distributed with a mean of 7.5 pounds. This number is lower than recent years and so researchers are interested in determining what factors are associated with lower birth weights. One researcher decides to look at the age of the mother to determine if younger mothers have babies that are significantly heavier or lighter than average. To study this the researcher collects data from 87 babies who were born to mothers between the ages of 16 and 18. Only one baby was measured per mother. Twins and other multiple births were excluded. The average weight for these babies was 7.3 pounds with a standard deviation of .6 pounds.
A recent study revealed that the average weight of babies born in the United States is
Using an ⍺ of .05, Locate the critical region.
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Reject H0 if t < _1.9879 |
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Reject H0 if t >1.9879 |
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Reject H0 if t >1.9879 or t < _1.9879 |
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