Resaerchers were interested in the effects of maternal stress on infants production of stress hormones. They measure the level of the hormone "cortisol", in infant saliva when the infants were 9 months old. The mothers were categorized according to the amount and type of stress they were experiencing during pregnancy . One group of mothers reported no extra ondinary stress during pregancy .Another group of mothers were living in New York city when the terrorist attack on the twin tower on september 11,2001. They were between 2 and 4 months on the day of the attack. The third group of mothers were refugee fleeing a war in their country.
Lecture(12.6):
Resaerchers were interested in the effects of maternal stress on infants production of stress hormones. They measure the level of the hormone "cortisol", in infant saliva when the infants
were 9 months old. The mothers were categorized according to the amount and type of stress
they were experiencing during pregnancy . One group of mothers reported no extra ondinary
stress during pregancy .Another group of mothers were living in New York city when the
terrorist attack on the twin tower on september 11,2001. They were between 2 and 4 months
on the day of the attack. The third group of mothers were refugee fleeing a war in their country.
.They all lived in the refugee camp for the entire time that they were pregnant.They were
re settleling in the US.
(1) What type of test should the reseacher use to test this hypotheses?
(2) What would the null and alternative hypotheses be?
(Select two answers for each)
(a) Z test
(b)single sample t test
(c)dependent sample t-test
(d) independent sample t -test
(e) ANOVA
(f) Pearson
(g) Chi Square goodness of fit test.
(h)Chi Square test for independece
(i)Ho: roe<=0
Ha: roe>0
(j)Ho: roe>=0
Ha: roe<0
(k)Ho : roe =0
Ha :roe != 0
(l) Ho: The categories are the same
Ha: The categories are different
(m)Ho: The two variables are not related
Ha: The two variables are related/dependent.
(n)Ho: U1= U2 =0
H1:U1- U2 !=0
(o) Ho: U1=U2=U3
Ha: not all means are the same.
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