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Statistics often requires one to make estimates of some measure (variable) about a set of units. The total number of such units is the population size.
Note that population, in this context, need not refer to people. If the study is about household expenditure on food (in some area), then the population is all households and the population size is the number of households (in that area). If the study is about diversity of insects in a field, the population may be all 1-metre squares in the field, and the size of the population will be the number of such plots - which will equal the area of the field.
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What does it means if the standard deviation is large?
that you have a large variance in the population and/or your sample size is too small
Density is a term that means a rapid increase in population size?
No. Density does not mean there has been a rapid increase in population. It means there are a large number of people living in a small geographic area, as in "New York City has a dense population."
What happens to the sample size if you increase the standard deviation?
The statistics of the population aren't supposed to depend on the sample size. If they do, that just means that at least one of the samples doesn't accurately represent the population. Maybe both.
When testing for differences between two means the sample population are?
You are testing the difference between two means of independent sample and the population variance are not known. from those population you take two samples of two different size n1and n2. what degrees of freedom is appropriate to consider in this case
When can you estimate a population's size when counting individuals in a sample of the population?
You can estimate a population's size when counting individuals if the density in a sample is greater than the population density.
What does it means if the standard deviation is large?
that you have a large variance in the population and/or your sample size is too small
Density is a term that means a rapid increase in population size?
No. Density does not mean there has been a rapid increase in population. It means there are a large number of people living in a small geographic area, as in "New York City has a dense population."
What happens to the sample size if you increase the standard deviation?
The statistics of the population aren't supposed to depend on the sample size. If they do, that just means that at least one of the samples doesn't accurately represent the population. Maybe both.
What is relative population size?
Relative population size is the size of an area's population as it compares to similar areas' populations. For example, the relative population size of a country would be what rank it had compared to the population of other countries.
The size of the population can affect the size of a predator population?
A prey
What is the population size of predator species directly controlled by?
The population size of predator species is typically controlled by the availability of prey, competition with other predators, and environmental factors like habitat and climate. The population size can fluctuate based on these factors, leading to dynamic predator-prey relationships.
What is the size of a population occupied an area of a specific size?
Population density
What is the relationship between sample and population?
From a sample of a population, the properties of the population can be inferred.
Suppose that a population that a population has mean equals 64 and standard deviation equals 18. A sample of size 36 is selected. What is the mean of the sampling distribution of means?
64.
What is the formula for expected number of deaths?
The sumation (each stratum of population) of risk * population size. For example: (risk*population size of group 1) + (risk*population size of group 2) + ... + (risk*population size of group n)
What is the difference between poplulation and community?
population means a number of people in a country, city, or any district area.community means a social group of any size.
Why is the sample mean an unbiased estimator of the population mean?
The sample mean is an unbiased estimator of the population mean because the average of all the possible sample means of size n is equal to the population mean.
