in a research study for the effect of smoking on infant birth weights, three var
ID: 2908611 • Letter: I
Question
in a research study for the effect of smoking on infant birth weights, three variables are recorded. Birth weight in grams, gestation period in weeks, and mother's smoking status (1 represents smoking, 0 represents did not smoke). Regression analysis was performed using SPSS, output for coefficients estimation is shown for modeling infant birth weights. use this information to choose the correct stayement(s).
a. Both Gestaion Period and mother's smoking status variables are significant at 5% level of significance in predicting birth weight.
b. Estimated regression coefficient for mother's smoking status variables indicates that if mother smoke the infant birth weight would be lower.
c. Unexpectedly. the estimated regression coefficient for mother's smoking status variables indicates that if mother smoke, the infant birth weight would be higher.
d. The equation for estimating average weight for infants would be: y = 1.030 x Gestation - .0.388 x Smoking Status
e. The equation for estimating average weight for infants would be :
y = -2424.563 + 141.691 x Gestation - 254.339 x Smoking Status
Explanation / Answer
Using this information the correct stayements are -
a. Both Gestation Period and mother's smoking status variables are significant at 5% level of significance in predicting birth weight. ( Since P-value for both the variable < 0.05)
b. Estimated regression coefficient for mother's smoking status variables indicates that if mother smoke the infant birth weight would be lower.
e. The equation for estimating average weight for infants would be :
y = -2424.563 + 141.691 x Gestation - 254.339 x Smoking Status
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