Multiple Choices
Answer (Choose 1 answer)
A simple random sample of 15-year-old boys from one city is obtained and their weights are listed below:
Let 20.025 1.960; t0.025;7 = 2.365
150 147 136 180 173 117
168 170
What is the width of 95%confidence interval estimate for the mean weight of this population? Assume that the standard deviation of the weights of all 15-year-old boys in the city is known to be 16.7 and population has normal distribution.
A. 13.96
Β. 27.93
C. 11.57
D. None of the other choices is correct
Ε. 23.15
