3, 05 5 T Table where DF 12 and, 105 meet In 1997, 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 3 of them smoked 21 or more cigarettes during their pregnancy, Does the sample data support the obstetrician's belief? Use a level of significance of 0.05, Can we use the normal model on this problem? Why or why not? Ho: vs, Ha; (Left, Right, Two-Tail)? State the level of significance, Critical Value