Suppose we want to know the percentage difference in mean height of British adults aged 20 years, 177.3 cm for men and 163.6 cm for women, a difference of 13.7 cm.1 Women are 100×(13.7/177.3)=7.7% shorter than men, whereas men are 100×(13.7/163.6)=8.4% taller than ...
A population in statistics is a whole group of people or objects from whichsamplesare taken. It is the entire group that we are interested in, and it includesall of the members of the group[1]. A population is the opposite of a sample, which is a fraction or percentage of a group. ...
Samples must resemble the broader population to make accurate inferences or predictions. All the participants in the sample should share the same characteristics and qualities.1So, if the study is about male college freshmen, the sample should be a small percentage of males that fit this descriptio...
13. What percentage of US wealth is managed by millionaires? (Source: Federal Reserve) According to the Federal Reserve, the top 10% in the US own 69.6% of the nation’s wealth. If you need a clearer example offinancial inequalityyou just need to know that around a third of the US we...
What is meant by the term significance in statistics? Evaluate (9!)/(5!). What is another technical term for a proportion? 5! is equal to ___. Which percentile is the value 12? The percentage of all possible values of the variable that lie between 6 and 10 is ___. What does...
Consumers of statistics say NNT (number needed to treat) is more meaningful. The reciprocal transform of the percentage point difference would be 1 ÷ (25%) = 1 ÷ 0.25 = 4. Thus, if 4 patients are treated withCureitall, you could expect to cure one more case of the disease than woul...
Probability and Statistics>Sampling> What is a Sample? In statistics, you’ll be working with samples — a part of apopulation. For example, if you want to find out how much the average American earns, you aren’t going to want to survey everyone in the population (over 300 million peop...
What value is 1.5 standard deviations below the mean? Explain how you found the answer. In a normally distributed data set with a mean of 22 and a standard deviation of 4.1, what percentage of the data would be between 13.8 and 30.2?
Or, in the vernacular, "we are 99% certain (confidence level) that most of these samples (confidence intervals) contain the true population parameter." The biggest misconception regarding confidence intervals is that they represent the percentage of data from a given sample that falls between the...
Our warming planet is expected to face serious water crisis(危机)in the coming decades-which means each nation's natural resource will be more important than ever.FORESTSPercentage of total land area Freshwater resource,cubic Freshwater resource,cubic covered by forests (2011)kilometers per year (...