Examples of Terms
500 Juniors from North High School are asked if they drive to school.
What is the term that describes all of the juniors at North High School
What is a population
Consistent, repeated deviation of the sample statistic from the population parameter in the same direction when we take many samples.
What is bias.
A number that describes a sample
What is a statisitic?
If the sample size increases, this happens to the margin of error.
What is decreases?
Some portion of a larger group, selected to represent that group.
What is a sample?
300 out of 400 questioned shoppers at grocery stores say that like to have plastic bags provided.
400 is an example of
What is a sample
The spread of values of the same sample statistic when we take many samples
What is variability?
A number that describes a population.
What is a parameter?
If I have 450 subjects and I want to pick 10 subjects, I would use how many digits in the random number table?
What is three?
The population is first divided into similar non- overlapping groups, then a simple random sample is selected from each group.
What is a stratified random sample?
U of State has 10,000 students. 200 are asked if U of State was their first choice school.
10,000 is an example of
What is a population?
Errors caused by the process of taking a sample
What is a sampling error?
A proportion that describes a how many members of the sample have a desired characteristic. We find this by dividing the number of subjects in the sample that have a desired characteristic over the total number of people in a sample.
What is a p hat?
A phone number is the bottom of a sales receipt to use to offer feedback on your shopping experience. 25% of the participants like the store. You describe this as a
What is a voluntary response sample.
When all units within a population are included - every single member is included.
What is a census?
90 out of 100 students served would like to have unused snow days taken off of the days at the end of the year.
.9 is an example of
What is a p hat?
The fact that values taken from various samples from the same population differ from each other even though the sample was random.
Random sampling error.
The number of percentage points we add and subtract from the sample proportion to estimate the true proportion.
What is the margin of error?
A sample of 25 students is taken from Dominion. Another sample of 25 students is taken from Herndon. A student argues that the sample from Herndon is better but the teachers says in fact it is not because the sample size is the same. It does not matter if this number of ______ is bigger.
What is the population?
A sample that includes members of a population that are easily accessed (not fair and not random).
What is a convenience sample?
100 students are in a sample.
Using this sample what could .1 could be used as
What is the margin of error?
The samples miss the mark repeatedly all in the same direction.
What is bias
1 over the square root of the sample size
What is the formula for finding the margin of error
I am fairly sure that 95 out of 100 intervals would contain a parameter
What is 95% confidence?
Selecting items for a sample by randomly chosing a group or groups. Each of the groups are varied in types of subjects they contain
What is a cluster sample