百度试题 题目1. Assuming that the population mean is 47.2 and the population deviation 6.4, what is the Zobt value for a sample mean of 52.1 if N= 8 A. 2.17 B. ,1.73 相关知识点: 试题来源: 解析反馈 收藏
Question: what is the p value A sample mean, sample size, and population standard deviation are provided below. Use the one-mean z-test to perform the required hypothesis test at the 5% significance level.x‾=23,n=23,σ=5,H0:μ=...
What is the 95% confidence interval for a population mean with a known mean of 96, a known variance of 9, and with a number of observations of 400?A. 95.613 to 96.387.B. 95.706 to 96.294.C. 95.118 to 96.882. 正确答案:B 分享到: 答案解析: Because we can compute the population stan...
Population variance tells us how the data points are distributed for a given population. It measures how spread the data points are in a population. It determines the variation or volatility in the data.Answer and Explanation: Step 1 of 3: First, we calculate t...
What is a sample statistic? Give examples.Sample Statistic:The sample attributes are known as sample statistic. The sample mean is an estimate of the population mean The sample mean is a sample statistic and the population mean is the population parameter....
A. The latest estimates suggest that nearly one in nine individuals do not have enough to eat between 2014 and 2016. B. Projections indicate that the 2015 MDG target is nearly reached, with 12.9 per cent of undernourished population.
The sample group taken should not be biased. This means that if the sample mean of the 1,000 CFA exam participants is 50, the population mean of the 200,000 test takers should also be approximately 50. Why Do Analysts Use Samples Instead of Measuring the Population?
But calculating the mean from the entire population might not be feasible. In such scenarios, a sample can serve as an estimate of the population. A sample will never perfectly mirror the population, because they are just a fraction of the population and so may not be representative of the ...
2) as to the sample size, the hospital controls may not be completely representative of the study population because it is not a random s 11、ample from all the target population. when compared with a random sample from all the target population, a hospital-based control might underestimate ...
What Does the Population Attributable Fraction MeanBeverly LevinePrev Chronic DisLevine B. What does the population attributable fraction mean? Prev Chronic Dis 2007;4:A14.