Question

6. In developing an interval estimate for a population mean, the population standard deviation σ was assumed to be 10. The interval estimate was 50.92 2.14. Had ơ equaled 20, the interval estimate would be a. 60.92 t 2.14 b. 50.92 12.14 c. 101.84 4.28 d. 50.92t 4.28 7. If the confidence level is reduced, the confidence interval a. widens. b. remains the same. C. narrows. d. disappears. 8. The zal value for a 95% confidence interval estimate for a population mean μ is a. 0.95 b. 0.025 c. 1.65 d. 1.96 9. After constructing a confidence interval estimate for a population mean, you believe that the interval is useless because it is too wide. In order to correct this problem, you need to a. increase the sample size b. increase the population standard deviation. C. increase the level of confidence d. increase the sample mean. 10. Which of the following is not a part of the formula for constructing a confidence interval estimate of the population mean? a. A point estimate of the population mean. b. The standard error of the sampling distribution of the sample mean. C. The confidence level. d. The value of the population mean.

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Answer 1

Solu C) Let ei-dy。0% c。nfidence inter ved far population mean 2-14 Jn 214 2 14 2.0 2-14-4:2呂 Ans 4 50.g2 4.23 ⑦st wemeduced confe lence inter ved then Hence the cantiodende interevel widlens