previously 4 of mothers smoked more than 21 cigarettes during their pr
Previously, 4% 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 4% today. She randomly selects 150 pregnant mothers and finds that 3 of them smoked 21 or more cigarettes during pregnancy. Test the researcher's statement at the a =0.1 level of significance. Identify the correct null and alternative hypotheses.
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