Please solve these problems and why we choose the answers. Thanks! 14, A 95% con
ID: 3353394 • Letter: P
Question
Please solve these problems and why we choose the answers. Thanks!
14, A 95% confidence interval was computed to estimate a population mean of 10. The resulting confidence interval is (5, 15). Does this appear to be a valid confidence interval? A) Yes, the population mean is in the center of the interval. B) No, the interval is too wide for a 95% confidence interval. C) No, the population mean should not be in the interval D) It can't be determined from the given information. 15. Central Middle School has calculated a 95% confidence interval fo r the mean height (A) of 11-year-old boys at their school and found it to be 56 ± 2 inches. Which of the following could be the 90% confidence interval based on the same data? A) 56 ±1 B) 56 ± 2 C) 56 ± 3 D) Without knowing the sample size, any of the above answers could be the 90% confidence interval.
Explanation / Answer
Ans 14
A)
As the mean lies in the middle of the confidence interval. and 5 and 15 are equidistant from the mean
Ans 15
D) The sample size is important to determine the confidence interval