Please show the process 6. In developing an interval estimate for a population mean, the population...
10 In developing an interval estimate for a population mean, the population standard deviation o was assumed to be 10. The interval estimate was 50.92 2.14. Had o equaled 20, the interval estimate would be a. 60.92 + 2.14 b. 50.92 + 12.14 c. 101.84 + 4.28 \. 50.92 + 4.28
Please give explanation................................................. Multiple Choice. Select the best response 1. An estimator is said to be consistent if a. the difference between the estimator and the population parameter grows smaller as the sample b. C. d. size grows larger it is an unbiased estimator the variance of the estimator is zero. the difference between the estimator and the population parameter stays the same as the sample size grows larger 2. An unbiased estimator of a population parameter is defined as...
Question 51 - Part a-c The interval estimate 18.5±2.5 is developed for a population mean in which the sample standard deviation s is 7.5. Had s equaled 15 instead, the interval estimate would be 37±5.0. a. True b. False In order to construct a confidence interval estimate of the population mean μ, the value of μ must be given. a. True b. False In general, increasing the confidence level will narrow the confidence interval, and decreasing the confidence level widens...
Which of the following correctly describes how the width of a confidence interval for a population mean changes when the population standard deviation is known? There is no change if just the sample size increases. The interval widens if the sample size stays the same and confidence level decreases. The interval narrows if the sample size increases and confidence level stays the same. The interval narrows if the sample size decreases and confidence level stays the same. The interval widens...
Which of the following does NOT correctly describe how the width of a confidence interval for a population mean changes when the population standard deviation is known? The interval changes if the sample size decreases. The interval changes if the sample size increases. The interval narrows if the sample size increases and confidence level stays the same. The interval widens if the sample size decreases and the confidence level stays the same. The interval widens if the sample size stays...
10. Fill in the blank. In developing a 96% confidence interval estimate for some normal population mean μ, the population standard deviation σ was 10, The interval estimate was found to be 12.6 ±3.64. Had σ equaled 5, the interval estimate would be 12. Based on a sample of size n 21 drawn from a normal population, the sample mean and sample standard deviation are, respectively, 15.68 and 1.36. We use T-test to test Ho : μ 15 vs H1...
QUESTION 1 In constructing a 95% confidence level estimate of the mean when the population standard deviation () is known what will be your score used in the formula? QUESTION 2 In constructing a 99% confidence level estimate of the mean when the population standard deviation (a) is known what will be your score used in the formula? HINT. Be sure to review page 236 "Finding Z scores from Known Areas - Special Cases and Tabel A-2. QUESTION 3 In...
The larger the confidence level used in constructing a confidence interval estimate of the population mean, the wider the confidence interval. True False
You want to estimate the population mean by taking a sample and constructing a 80% confidence interval. You know the population standard deviation is 6.08. Compute the minimum sample size needed to ensure that your interval estimate has a margin of error less than or equal to 1.8.
A random sample of 24 observations is used to estimate the population mean. The sample mean and the sample standard deviation are calculated as 128.4 and 26.80, respectively. Assume that the population is normally distributed. [You may find it useful to reference the t table.) a. Construct the 95% confidence interval for the population mean. (Round intermediate calculations to at least 4 decimal places. Round "t" value to 3 decimal places and final answers to 2 decimal places.) Confidence interval...