The center of a normal curve is - answer-the mean of the distribution
For a normal distribution, a positive value of z indicates that - answer-the sample mean is larger than the population mean
Which of the following is not a characteristic of the normal probability distribution? - answer-The...
Study Guide Econ 306 - Exam 1 & Exam 2
& Final Exam - WKU
The center of a normal curve is - answer-the mean of the distribution
For a normal distribution, a positive value of z indicates that - answer-the sample mean is larger than the population mean
Which of the following is not a characteristic of the normal probability distribution? - answer-The standard deviation must be 1
Larger values of the standard deviation result in a normal curve that is - answer-wider and flatter
A simple random sample of 100 observations was taken from a large population. The sample mean and the standard deviation were determined to be 80 and 12 respectively. The standard error of the mean is - answer-
1.20
A theorem that allows us to use the normal probability distribution to approximate the sampling distribution of sample means and sample proportions whenever the sample size is large is known as the - answer-
central limit theorem
As the sample size increases, the - answer-standard error of the mean decreases
A finite population correction factor is needed in computing the standard deviation of the sampling distribution of sample means - answer-whenever the sample size is more than 5% of the population size
Stratified random sampling is a method of selecting a sample in which - answer-the population is first divided into strata, and then random samples are drawn from each stratum
A sample of 92 observations is taken from an infinite population. The sampling distribution of xbar is approximately - answer-normal because of the central limit theorem
Sampling distribution of xbar is the - answer-probability distribution of the sample mean Four hundred people were asked whether gun laws should be more stringent.
Three hundred said "yes," and 100 said "no." The point estimate of the proportion in the population who will respond "yes" is - answer-0.75
In point estimation - answer-data from the sample is used to estimate the population parameter
Convenience sampling is an example of - answer-nonprobabilistic sampling
Which of the following is an example of nonprobabilistic sampling? - answer-
judgment sampling
As the sample size becomes larger, the sampling distribution of the sample mean approaches a - answer-normal distribution
As the sample size increases, the variability among the sample means - answer-decreases
Whenever the population has a normal probability distribution, the sampling distribution of xbar is a normal probability distribution for - answer-any sample size
In a standard normal distribution, the probability that Z is greater than zero is - answer-0.5
Z is a standard normal random variable. What is the value of Z if the area to the right of Z is 0.9803? - answer--2.06
A negative value of Z indicates that - answer-the number of standard deviations of an observation is to the left of the mean
The probability distribution of all possible values of the sample proportion pbar is the - answer-sampling distribution of pbar
For a continuous random variable x, the height of the function at x is - answer-named the probability density function f(x)
Given that Z is a standard normal random variable, what is the value of Z if the area to the right of Z is 0.5? - answer-0.0000
The z score for the standard normal distribution - answer-can be either negative or positive
For any continuous random variable, the probability that the random variable
takes avalue less than zero - answer-is any number between zero and 1
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