February 22, 2021

An exit survey of 500 voters revealed that 210 of them favor a particular referendum issue. 1. Find the 90%, 95% and 99% confidence intervals for the proportion of all voters who favor the issue.

Solution For a 90% confidence interval, use the formula;  
February 22, 2021

Example in which confidence intervals for a mean or a proportion, or both, are obtained from a sample size

Answer Statisticians normally estimate population parameters using sample data. In their statistical structures, confidence interval is arrived at ……………..
February 22, 2021

Obtaining the sample size for a proportion

Answer In order to obtain a sample size for a proportional, formula is used in like with well-known population size, clearly stipulated sample proportion and the margin of error. Therefore, to find …………….
February 22, 2021

Obtaining the sample size for the mean value

Solution Answer Statistically, a sample is that percentage of the entire population. Deciding on a given sample size depends on factors such as the original population size. In order to obtain…………………………………………………….
February 22, 2021

obtaining the confidence interval for a ratio

Answer In order to obtain the confidence intervals for a ratio, we calculate group sample sizes that are necessary in achieving specific interval width of the ratio of distinct and two independent data proportions. Here, an assumption is ………………………………………
February 22, 2021

When to use the t-distribution and when the normal distribution for the test of hypothesis

Answer The t-distribution is most useful for sample sizes which are small, or when the deviation of the population standard is not known, or both. Therefore, one must use ……………………………..
February 22, 2021

confidence level

Answers The confidence level in statistics is defined as that probability level in which the value of a given parameter falls within a given range of values. It indicates the probability at which the estimate of a statistical parameter such as the mean in a sample survey is similarly true […]
February 22, 2021

sampling distributions

Answers In statistics, a sampling distribution is that probability distribution mostly of a statistical data that is obtained from a very large number of samples drawn from a given population. It is the distribution of frequencies of a range of district outcomes ……
February 18, 2021

Real Examples of the Use of Probability to Predict Future Events

In the similar way as weather forecast is used to predict future atmosphere behaviors, there exist numerous real examples of the use of probability. One of the real-life examples of the use of probability in predicting future events is the sports statistics. Notably, in the world of sports, football or […]