Question

1. The mean for birth weight for all births is 3300 grams with a standard deviation of 750 grams. We want to know whether birth weights for infants who died of SIDS is significantly different from that of other infants. In a sample of 36 infants who ultimately died of SIDS, the mean birth weight is 2890.5 grams, with a standard deviation of 720 grams. Use α = .10.
2. What is the null and research hypothesis?
3. construct the 90% interval for the birthrate of infants who died from SIDS
4. What would the SEM be if instead of 36 infants, your sample contained 60 infants?
5. what is the SEM
6. what is the critical value

Answer 1

Ho 43300 vs Hi ut 3300 (Research hypothesis) 90% c. I for birthrate of infants who died from S.IDS ( + Cols 2890.5 + 1.647 720 136 = (28 90.5 I 196:8) = ( 2693.7, 3087.3 ) Standard Error of Mean (SEM) = - Jh 720 √60 92.95 = critical value - Cola C0.05=1.64.