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Small-Sample Hypothesis Test In 1997, 4% of mothers smoked
Chapter , Problem 28AYU(choose chapter or problem)
Problem 28AYU
Problem
Small-Sample Hypothesis Test In 1997, 4% of mothers smoked more than 21 cigarettes during their pregnancy. An obstetrician believes that the percentage of mothers who smoked 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 pregnancy. Does the sample data support the obstetrician’s belief? Use the α = 0.05 level of significance.
Questions & Answers
QUESTION:
Problem 28AYU
Problem
Small-Sample Hypothesis Test In 1997, 4% of mothers smoked more than 21 cigarettes during their pregnancy. An obstetrician believes that the percentage of mothers who smoked 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 pregnancy. Does the sample data support the obstetrician’s belief? Use the α = 0.05 level of significance.
ANSWER:
Problem 28AYU
Answer:
Step1 of 2:
We have n = 120, x = 3, = 0.05.
120*0.04(1 - 0.04) < 10.
4.6 < 10
a).
Consider the appropriate null and alternative hypothesis are:
against