Two differentconfidence intervals taken from the same samples are (9.14, 15.34)a

Question

Two differentconfidence intervals taken from the same samples are (9.14, 15.34)and (7.43, 17.05). One is based on a 95% confidence level andthe other is based on a 99% confidence level. What is thesample mean and which is the 95% confidenceinterval?

a. mean=12.24;(9.14, 15.34) is the 95% confidence interval

b. mean=12.24;(7.43, 17.05) is the 95% confidence interval

c. mean=12.24,but the interval cannot be determined without knowing the samplesize.

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Explanation / Answer

mean =( 9.14+15.34)/2 = 12.24
hence correct answer is:
c. mean=12.24, but the interval cannot be determined withoutknowing the sample size.

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