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(Choose 1 answer)
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Assuming that the weights (kg) of two groups of children with non-smoking and smoking mothers both follow normal distributions with standard deviations of 0.576 and 0.776.respectively. Data for two random samples from these two groups are as follows:
A. 0.687
B. 0.894
C. 0.978
D. 0.789
n₁ = 20,x₁ = 3.4;n2 = 17,23.2.
What is the width of the 95% confidence interval on the difference in population means?
Let 20.05 1.65; 20.025 1.96.
