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In order to determine the size of a sample the standard deviation of the population must be estimated To do this you can either take a pilot survey or it can be approximated based on a knowledge of?
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∙ 12y ago
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When the population standard deviation is not known the sampling distribution is a?
If the samples are drawn frm a normal population, when the population standard deviation is unknown and estimated by the sample standard deviation, the sampling distribution of the sample means follow a t-distribution.
When to use t-test?
You use the t-test when the population standard deviation is not known and estimated by the sample standard deviation. (1) To test hypothesis about the population mean (2) To test whether the means of two independent samples are different. (3) To test whether the means of two dependent samples are different. (4) To construct a confidence interval for the population mean.
What does the word estimation mean?
It means to guess at something. An imprecise amount or measurement.
When to use t statistic instead of z statistic for calculating whether a parameter falls above or below the lower confidence interval?
the standard rule of thumb is to use the t-statistic when the sample size is less than 30 or if the population standard deviation is unknown/estimated from sampling data and to use the z-statistic for 30 and above.
When do you use n-2 degrees of freedom?
With n observations, it could be when 2 distributional parameters have been estimated from the data. Often this may be the mean and variance (or standard deviation( when they are both unknown.
When the population standard deviation is not known the sampling distribution is a?
If the samples are drawn frm a normal population, when the population standard deviation is unknown and estimated by the sample standard deviation, the sampling distribution of the sample means follow a t-distribution.
What is the estimated population mean with a sample of 36 and a standard deviation of 0.03?
What is the sample mean?
What is the estimated population mean with a sample of 36 and the standard deviation of 0.03?
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What is the estimd population mean of sample 36 mean weight 3.01 standard diviation 03?
The answer will depend on the population mean of what variable? Height?, length or is it simply weight. If it is weight, the estimated (not estimd) population mean is 3.01 units: the same as the sample mean. The standard deviation (not diviation) is irrelevant.The answer will depend on the population mean of what variable? Height?, length or is it simply weight. If it is weight, the estimated (not estimd) population mean is 3.01 units: the same as the sample mean. The standard deviation (not diviation) is irrelevant.The answer will depend on the population mean of what variable? Height?, length or is it simply weight. If it is weight, the estimated (not estimd) population mean is 3.01 units: the same as the sample mean. The standard deviation (not diviation) is irrelevant.The answer will depend on the population mean of what variable? Height?, length or is it simply weight. If it is weight, the estimated (not estimd) population mean is 3.01 units: the same as the sample mean. The standard deviation (not diviation) is irrelevant.
What was the population of France in 1914?
The population of France in 1939 was approximated to be 41,510,000. In this year, there were more deaths than births with a natural change of minus 30,000.
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.. :)
How many days is 7296 days?
The answer, when rationalized, rounded, estimated, approximated, sanded and stained,is precidely 7,296 .
When to use t-test?
You use the t-test when the population standard deviation is not known and estimated by the sample standard deviation. (1) To test hypothesis about the population mean (2) To test whether the means of two independent samples are different. (3) To test whether the means of two dependent samples are different. (4) To construct a confidence interval for the population mean.
What is the estimated population of a north American porcupine?
The estimated population is about 6,000
What is the estimated population in the Philippines as of 2009?
90,000 million is the estimated number of the population.....
What is the estimated population of KilifiCounty?
The estimated population of Kilifi County in Kenya is 1,109,735.
What is the estimated population of emus?
The estimated population of emus in the world is 630,000 - 7250,000
