Sampling Techniques
This sampling method involves selecting individuals completely at random, where every member of the population has an equal chance of being chosen.
What is simple random sampling?
This distribution is used to model the number of successes in a fixed number of independent trials.
What is the binomial distribution?
This theorem explains why the sampling distribution of the mean is approximately normal for large samples.
What is the Central Limit Theorem?
This type of random variable takes on a finite or countably infinite number of values.
What is a discrete random variable?
The distribution of a sample statistic over many samples is called this.
What is a sampling distribution?
In this sampling method, the population is divided into subgroups, and entire subgroups are randomly selected.
What is cluster sampling?
For a binomial distribution, the two possible outcomes are called this.
What are success and failure?
In a standard normal distribution, this is the mean and standard deviation.
What are 0 and 1?
This is the sum of all probabilities in a valid probability distribution.
What is 1?
As sample size increases, the standard error of the mean does this.
What is decrease?
This method involves dividing the population into homogeneous subgroups and randomly sampling from each subgroup.
What is stratified sampling?
In a binomial distribution, if the probability of success is 0.6 and the number of trials is 10, the expected number of successes is this.
What is 6?
This function on the calculator is used to calculate the probability of x less than a value for the normal distribution.
What is normcdf(mu,sigma,-1E99,x)?
For a discrete random variable, the mean is also known as this.
What is the expected value?
For a population with a normal distribution, the sampling distribution of the mean will be normal for this sample size.
What is any sample size?
When a researcher selects individuals who are easiest to access, they are using this non-random sampling technique.
What is convenience sampling?
In a binomial experiment, this condition must remain constant across trials.
What is the probability of success?
This score represents how many standard deviations a value is from the mean.
What is a z-score?
X is normally distributed, this is the probability that x=15.
What is 0?
If the population proportion is 0.6 and the sample size is 50, the mean of the sampling distribution of the sample proportion is this.
What is 0.6?
Name the sampling method where each kth individual is selected from a list after a random starting point.
What is systematic sampling?
The function on the calculator used to calculate the probability of exactly x successes in a binomial distribution is this.
binompdf(n,p,x)?
If the mean score is 115 and the standard deviation is 10, the z-score for a score of 130 is this.
What is 1.5?
In probability (density or mass) functions this condition must hold true for all possible values of the random variable (x).
What is non-negativity (probabilities must be greater than, or equal to, 0)
This is the formula for the standard error of the mean when sampling from a population with standard deviation σ and sample size n .
What is σ / √n?