14. The age of mothers who smoked during pregnancy were compared to the age of m
ID: 3135020 • Letter: 1
Question
14. The age of mothers who smoked during pregnancy were compared to the age of mothers who did not. The sample mean age was larger in the group of mothers who did not smoke, and the 95% confidence interval for the difference in mean age between the 2 groups was .20 to 2.62 years. What can be said about the (two- sided) p-value for testing the null hypothesis of equal population means? a. The p value is greater than = 0.05 b. The p value is equal to = 0.05 c. The p value is less than = 0.05 d. Cannot be determined from the information given.
Explanation / Answer
As the whole interval is totally greater than 0 (0.20 to 2.62), then the P value must be less than 1 - 0.95 = 0.05.
Hence,
OPTION c. The p value is less than = 0.05 [ANSWER, C]
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