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Fabulous Vocabulary
Margin of Error
True or False
Be Confident!
Some Mistakes!
100

If a statistical study systematically favors certain outcomes it is considered to be what?

What is Biased

100
To find the margin of error for 95% confidence is roughly equal to 1 over the square root of what?
What is n or the sample size
100
The purpose of sampling is to gain information about a parameter
False. The purpose of sampling is to gain information about a population.
100
A poll found that 57% of adults bought a lottery ticket in the past twelve months. Given the margin of error is 3%, write a 95% confidence statement.
I am 95% confident that between 54% and 60% of all adults bought a lottery ticket in the last twelve months.
100
errors caused by the act of taking a sample that cause sample results to be different from the result of a census.
What are sampling errors
200

A response sample that chooses itself by responding to a general appeal. Examples of these are write-in or call-in opinion polls

What is a voluntary response sample

200
The ____ says how close the sample statistic lies to the population parameter
What is the margin of error
200
We often use voluntary response to estimate the value of a population parameter
False. We often use a sample statistic from a simple random sample to estimate the value of a population parameter.
200
A poll found that 75% of teenagers have some sort of portable technological device. With a margin of error of 4%, write a confidence statement.
I am 95% confident that between 71% and 79% of teenagers have some sort of portable technological device.
200
the deviation between the sample statistic and the population parameter caused by chance in selecting a random sample.
What is a random sampling error
300

a number that describes a sample

What is a statistic

300
the ____ says what percent of all the possible samples satisfy the margin of error
What is the level of confidence
300
In planning a sample survey, you want to aim for a small bias by using random sampling.
True!
300
The phrase 95% confidence means what?
You have used a sampling method that gives a result this close to the truth 95% of the time.
300
errors not related to the act of selecting a sample from the population
What is a nonsampling error
400
a number that describes the truth
What is a parameter
400
The statistic + or - the margin of error is a
What is A confidence interval
400
To reduce variability, make the sample size larger.
True
400
What should be done if you want a smaller margin of error with the same confidence?
Take a larger sample
400
This occurs when some groups in the population are left out of the process of choosing the sample
What is undercoverage
500
what describes how spread out the values of the sample statistics are when we take samples
What is variability
500
with an SRS of size n=200, find the margin of error
.07% ....1 divided by the square root of 200= .07%
500
Mr. Doty is the coolest teacher in the school
What is false! Who is Mr. Caniglia?
500
True or false: a sample survey can choose to use a confidence level other than 95%
True. We pay for a higher confidence with a larger margin of error. For the same sample, a 99% confidence level requires a larger margin of error than 95% confidence.
500
The failure to obtain data from an individual selected for a sample. This is the most serious problem facing sample surveys today. :(
What is nonresponse