Unstandardized Coefficients Coefficients Beta Model Std Error 2324.563 352.388 (

Question

Unstandardized Coefficients Coefficients Beta Model Std Error 2324.563 352.388 (ConstanD Gestation (weeks 141.691 Smoking Status -6.597 15.029 5.664 1030 254.339 44903 388 Dependent Variable: Birth Weight (in grams) In a research study for the effect of smoking on the infant birth weight, three variables were recorded, and they are infant "Birth Weight in grams", "Gestation period in weeks", and mother's "Smoking Status" (1 represent smoke and 0 represent did not smoke). A regression analysis was performed using SPSS and the output for coefficients estimation is shown below for modeling the infant birth weight. Use the information in the table to select the correct statements. (There may be more than one correct answer.) Both "Gestaton perodi and mother's "Smoking Status" variables are insignificant variables, at 5% level of significance, in predicting infant birth weight. Unexpectedly, the estimated regression coefficient for mother's "Smoking Status" variable indicates that if mother smoked the infant birth weight would be higher. The equation for estimating average weight for infants would be y =-2324563 + 141.691 x Gestation 254.339 x Smoking_Status The equation for estimating average weight for infants would be y-1 388 x Smoking_Status .030 x Gestation- n coefficient for mother's "Smoking Status" variable indicates The estimated regressio that if mother smoked the infant birth weight would be lower.

Explanation / Answer

Answer-

Correct statements are 3 and 5.

1. As p-values given in the tables are equal to 0 which is less than 0.05 so null hypothesis is rejected at 5% level of significance and thus variables are significant.Thus it is false.

2. Slope for the smoking status is -254.339 which is negative suggesting there is a negative relationship between birth weight and smoking status. Thus it is also false.

3. regression equation is-

Y = -2324.563 + 141.691 * gestation - 254.339* smoking status

Thus it is true.

4.This is false as above given equation is true.

5. Slope for the smoking status is -254.339 which is negative suggesting there is a negative relationship between birth weight and smoking status. Thus it is true.

Answers

TY!

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