Bias
Find the Error
Type Of Sample
Operations
100
This type of bias is introduced by excluding people from the survey (e.g. a phone survey excludes people who don't have phones)

What is undercoverage bias?

100

3 HA students were asked whether they think the district should include more snow days in the calendar.

n is not large enough
100

This type of sampling is used.

The school is broken down by grade level, and from each grade level, a random sample of students is chosen.

What is a stratified sample?

100

The following formula calculates this:

SUM(x)

---------

n

What is the mean?

200

This type of bias is introduced when asking about a subject that respondents may not answer truthfully too. (e.g. illegal activities)

What is Response Bias?

200

A survey question about bottled water includes this statement:

"...even if bottled water is 60x more expensive than filling a bottle with tap water..."

This question contains wording bias

200

This type of sample is used:

The Junior class is sampled in order to get a feel for HA students opinions on school lunch.

What is a cluster Sample?

200
To calculate this, you take the number of choices and subtract 1.

What is Degree of Freedom?

300

This type of bias is introduced when a survey is given to people, but they do not respond. (e.g. throwing away a mail survey)

What is non-response bias?

300

A Z-test is used to see if there if there is a difference in the mean amount of coffee dispensed from a machine.

A T-test is used for this case

300
This type of sample is used:

All names of students are put into a hat, Mr. Tracy randomly chooses 10 students from the hat to participate in games at the pep rally.

What is an SRS?

300

This letter stands for the sample size.

What is n?

400

This type of bias is introduced when a question sways respondents to answer a certain way.

What is Wording Bias?

400

To find out what students think about school lunch at HA, every student in the school is sampled as they walk through the front door.

This is a census.

400

This type of sample is used:

Every third person is surveyed when they come in the door to school.

What is a systematic sample?

400

This letter/number combo expresses the first group in a multi-group operation.

what is x1?

500

This type of bias is present in the following case:

A table is set up where respondents can choose to participate in the survey as they pass by.

What is Voluntary Response Bias?

500
The first 100 kids to arrive to school in the morning are asked if they hit the snooze button this morning.

Sampling the FIRST 100 would skew the results (because they are early, they are less likely to have hit the snooze button)

500

Each student in the school is assigned a number. Mr Ditzel uses a random number generator to select which four students he will fail in their math class this year.

What is an SRS?

500

This is the minimum value for np or nq.

What is 10?

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