Previously, 4% of mothers smoked more than 21 cigarettes during their pregnancy.

Question

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 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. What are the null and alternative hypotheses? 0.04 versus H1: P 0.04 Type integers or decimals. Do not round.) Because nPo (1-Po)-10, the normal model! Round to one decimal place as needed.) | be used to approximate the P-value

Explanation / Answer

np(1-p) = 120*0.04*(1-0.04) = 4.6 < 10, the normal model can not be used to approximate the P - value.

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