Question

Previously, 5% 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 5% today. She randomly selects 125 pregnant mothers and finds that 5 of them smoked 21 or more cigarettes during pregnancy Test the researcher's statement at the 0.05 level of significance What are the nul and alternative hypotheses? Ho: P = 0.05 versus Hy: P < 0.05 (Type Integers or decimals. Do not round.) Because Po(1-P)- M10, the normal model (Round to one decimal place as needed.) be used to approximate

Answer 1

Sol (a) what are the null hypotheses and alternative hypothesis? Ho: P = 0.05 Hii P0.05 - (b) because npo (1-P) 2 Here Po= a where x= 5 n = 125 / / np. (1-P) = 125*if*(1-10) = 5*(128) = 4.8 = Because np. (1-P) =(4.87 10, the normal o model (may not be used to approximate the E P-value Scanned with CamScanner