Lecture(12.6b):  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

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Lecture(12.6b):

 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 correlation t-test (roe)

  (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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