Researchers were interested in the effects of maternal stress on infants\' produ
ID: 3067479 • Letter: R
Question
Researchers were interested in the effects of maternal stress on infants' production of stress hormones. They measures the level of the hormone "cortisol" in infant saliva when all the infants were 9 months old. The mothers were categorized according to the amount and type of stress they experienced while pregnant. One group of mothers reported no extraordinary stressors while pregnant. One group of mothers were living in the New York City area when the terrorist attack on the twin towers happened on Sept 11, 2001. They were all between 2 and 4 months pregnant with the infant in the study during that day. The third group of mothers were refugees fleeing a war in their country. They all lived in a refugee camp for the entire time that they were pregnant with the infant in the study but were resettled in the United States within 2 months of the child's birth. The researchers hypothesized that chronic (refugees) or severe (9/11) stressors during pregnancy would impact the stress hormone production in the child long after birth. What type of test should they use to test this hypothesis?
a z-test
an independent samples t-test
C) a dependent samples t-test
an ANOVA
a single sample t-test
A)a z-test
B)an independent samples t-test
C) a dependent samples t-test
D)an ANOVA
E)a single sample t-test
Explanation / Answer
Here the number of groups are three so the most appropriate test would be ANOVA.
Two independent t test for two independet groups
Z test not applicable
single sample t test not applicable and
samples are not paired so not at all dependent samples t test.
So the most appropriate would be an ANOVA.
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