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Previously, 3% of mothers smoked more than 21 cigarettes during their pregnancy. An obstetrician believes that the percentage of mothers who smoke 21 cigarettes or
Previously, 3% of mothers smoked more than 21 cigarettes during their pregnancy. An obstetrician believes that the percentage of mothers who smoke 21 cigarettes or more is less than 3% today. She randomly selects 120 pregnant mothers and finds that
2 of them smoked 21 or more cigarettes during pregnancy. Test the researcher's statement at the =0.05
level of significance.
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