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When the sample size is large valid confidence intervals can be established for the population mean irrespective of the shape of the underlying distribution?
Wiki User
∙ 13y ago
Yes, but that begs the question: how large should the sample size be?
Wiki User
∙ 13y ago
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When do you know when to use t-distribution opposed to the z-distribution?
z- statistics is applied under two conditions: 1. when the population standard deviation is known. 2. when the sample size is large. In the absence of the parameter sigma when we use its estimate s, the distribution of z remains no longer normal but changes to t distribution. this modification depends on the degrees of freedom available for the estimation of sigma or standard deviation. hope this will help u.... mona upreti.. :)
What does a 95 percent confidence interval tell you about the population proportion?
There is a 95% probability that the true population proportion lies within the confidence interval.
What is the mean of the sampling distribution equal to?
The mean of the sampling distribution is the population mean.
When a population distribution is right skewed is the sampling distribution normal?
No, as you said it is right skewed.
What is a sampling distribution?
The sampling distribution for a statistic is the distribution of the statistic across all possible samples of that specific size which can be drawn from the population.
The t distribution is used to construct confidence intervals for the population mean when the population standard deviation is unknown?
It can be.
When population distribution is right skewed is the interval still valid?
You probably mean the confidence interval. When you construct a confidence interval it has a percentage coverage that is based on assumptions about the population distribution. If the population distribution is skewed there is reason to believe that (a) the statistics upon which the interval are based (namely the mean and standard deviation) might well be biased, and (b) the confidence interval will not accurately cover the population value as accurately or symmetrically as expected.
In a study using 9 samples and in which the population variance is unknown the distribution that should be used to calculate confidence intervals is?
In a study using 9 samples, and in which the population variance is unknown, the distribution that should be used to calculate confidence intervals is
What percentage is the second distribution sextile of a normal bell curve?
By definition, the 1st 6-tile is the point below which 1/6 of the population falls (irrespective of which distribution is involved). The 2nd 6-tile is the point below which 2/6 of the population falls. This is 100 * 1/3 ~ 33.3% of the population.
When you use a confidence interval to reach a conclusion about the population mean you are applying a type of reasoning or logic called?
normal distribution
How do you find the population mean for a 95 percent confidence interval?
It depends whether or not the observations are independent and on the distribution of the variable that is being measured or the sample size. You cannot simply assume that the observations are independent and that the distribution is Gaussian (Normal).
What is the difference between a population distribution and sampling distribution?
Population distribution refers to the patterns that a population creates as they spread within an area. A sampling distribution is a representative, random sample of that population.
What is the population density and distribution for Portugal?
10,486.22 this is the density population and this is the distribution population 2,00465.789
What is population distribution usually greatly affected by?
Population distribution is usually greatly affected by what?
Does China's distribution population compare to the US's distribution population?
yea
Can you make a sentence with population distribution in it?
Population distribution is the way a population is apread out over an area.
Can you make a sentence with population distribution?
Population distribution is mapped by geographers all over the world or Population distribution is observed daily by geographers.
