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Sampling is used in statistics because you can't possibly ask everyone in the world how old they are in order to find out the average age of all humans. But by getting a representative sample, you can make a pretty accurate estimation of the average age of everyone on the planet.
Another less obvious reason sampling is used is to get rid of bias. If you ask 10 of your friends if they like apples and 9 of them say they do, you can't say that 90% of people like apples. Maybe 90% of your friends, but it's very important to get a sample that accurately represents and reflects the population you are studying.
Wiki User
∙ 15y ago
Wiki User
∙ 14y agoSamples are used to describe the popularion (hence the name descriptive statistics). To perform a census or obtain data from a population is usually time consuming and costly.
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What sample statistic is used to estimate a population parameter?
A point estimate is a single value (statistic) used to estimate a population value (parameter)true apex
What is the description of sample?
Statistic
What is the difference between 2 sample z test statistic and 2 sample t test statistic?
erwtwertgrtewh
What does the test statistic measure?
The test statistic is a measure of how close the sample proportion is to the null value.
What are t test and F test In which situation these are applied?
Both are parametric test. The t-test uses a test statistic that is related to the sample mean(s) and is used to compare that with the mean of another sample or some population. The F-test uses a test statistic that is related to the sample variance and is used to compare that with the variance of another sample or some population. Both tests require identical independently distributed random variables. This ensures that the relevant test statistics are approximately normally distributed.
What symbol is used for the standard deviation when it is a sample statistic?
σ (sigma)
A numerical value used as a summary measure for a sample such as sample mean is known as a?
This is called a sample statistic. They are often used to give a general picture of a more specific whole.
What is the statistic that is used to estimate a population standard deviation?
the sample standard deviation
A Numerical Measure from a Sample Such as a Sample Mean Is Known?
sample statistic
Is a sample a number describing some characteristic of a statistic?
No. A statistic is a number describing a characteristic of a sample.
What sample statistic is used to estimate a population parameter?
A point estimate is a single value (statistic) used to estimate a population value (parameter)true apex
What is the description of sample?
Statistic
What is the difference between 2 sample z test statistic and 2 sample t test statistic?
erwtwertgrtewh
What is the the relationship between population and sample parameter and statistic?
The relations depend on what measures. The sample mean is an unbiased estimate for the population mean, with maximum likelihood. The sample maximum is a lower bound for the population maximum.
What is a numerical summary of a sample?
That is the definition of a statistic
As the sample size increases what does the expected value of M do?
You have not defined M, but I will consider it is a statistic of the sample. For an random sample, the expected value of a statistic, will be a closer approximation to the parameter value of the population as the sample size increases. In more mathematical language, the measures of dispersion (standard deviation or variance) from the calculated statistic are expected to decrease as the sample size increases.
Does a parameter describe a population or a sample?
A parameter describes a population. A statistic describes a sample.
