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(Choose 1 answer)
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☐ A
A. 0.894
☐ C
B. 0.687
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C. 0.978
D. 0.789
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:
n₁ = 20,x₁ = 3.4;
n₂ = 17,x2 = 3.2.
What is the width of the 95% confidence interval on the
difference in population means?
Let Zoos = 1.65; Zo.ozs = 1.96.
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