Question

19. The 99% confidence interval is _________ than 95% confidence interval in a same problem. a. smaller b. larger 20. Suppose 95% confidence interval of the population mean is (4.5, 9.7). (20.a) The population mean must be in the range (4.5, 9.7). a. True b. False (20.b) What is the chance of error if you say that the population mean is somewhere in the range (4.5, 9.7) a. 0.95 b. 0.05 c. 0 d. 0.5 (20.c) How sure is it that population mean is within (4.5, 9.7)? a. With 95% of sureness b. With 5% of sureness (20.d) Based on this confidence interval, can you infer with 95% of confidence that the population mean is more than 5? a. Yes b. No (20.e) Based on this confidence interval, can you infer with 95% of confidence that the population mean is more than 4? a. Yes b. No

Answer 1

19.The 99 % confidence interval is -----larger ---than 95% confidence interval. Because the Z statistic value at 99% confidence level is more than at 95%.

20.a. Yes it is true that the population mean falls between the described range.

20.b .b.0.05 , There is 0.05 chance of error that population lies within the described limit.

20.c.a) with 95 % of sureness we can say that population lies within the described range.

20.d. a. Based on confidence interval, yes the population mean is more than 5.

20.e. b. No , based on the confidence interval we cannot say that population mean is greater than 4 because the lower limit is 4.5