Central Limit Theorem
As the sample size becomes large, the sampling distribution of the sample mean, x can be approximated by a normal distribution
The probability distribution of all possible values of the sample proportion p is the....?
Sampling distribution of p
What is an example of nonprobabilistic sampling?
Judgement Sampling
The closer the sample mean is to the population mean, increases or decreases sampling error?
Decreases
As the sample size increases, does the standerd error increase of decrease?
Decrease
The sample mean is the point estimator of?
The population mean (Mu)
The standard deviation of all possible x values is called the?
Standard error of the mean
As the sample size becomes larger, the sampling distribution of the sample mean approaches what kind of distribution?
Normal distribution
What is the difference between the value of the sample mean and the value of the population mean?
Standard error
The probability distribution of all possible values of the sample mean x is
The sampling distribution of x
The standard deviation of a point estimator is called?
Standard error
A single numerical value used as an estimate of a population parameter is known as?
Point estimate
A simple random sample of size n from an infinite population of size N is to be selected. Each possible sample should have which probability of being selected?
The same probability
A simple random sample of 28 observations was taken from a large population. The sample mean equaled 50. What is fifty?
A point estimate
A sample of 25 observations is taken from an infinite population. The sampling distribution of p is normal under which standards?
Approximately normal if np>5 and n(1-p)>5
Doubling the sample size will..? By how much?
Reduce the standard error of the mean by 70%
What is the probability distribution showing all possible values of the sample mean?
The sampling distribution
The set of all elements of interest in a study is?
Population
The value added and subtracted from a point estimate in order to develop an interval estimate of the population parameter is known as the..?
Margin of error
What is the proper distribution to use for the interval estimation of x when sigma is known and the sample is large?
Normal distribution
If an interval estimate is said to be constructed at the 90% confidence level, the confidence coefficient level would be?
.9
In interval estimation, when is the t distribution applicable?
When the sample standard deviation is used to estimate the popultation standard deviation
In developing an interval estimate, if the population standard deviation is unknown, what can be used?
The sample standard deviation
The sample size of 200 elements is selected from a population with a known sd. For an interval estimate of M, what is the proper distribution to use?
Normal distribution (sd is known!!)
From a normaly distributed population, a sample of 25 is selected and the sd is computed. for the interval estimate of M, what is the proper distribution?
T-distribution with 24 degrees of freedom
At a 95% confidence interval for a population mean is determined to be 100-12, If the confidence coefficient is reduced to .9 what happens to the interval for M now?
It becomes narrower
An interval estimate is a range of values used to estimate what?
A population parameter
When the level of confidence decreases whta happens to the margin of error?
It becomes smaller