Sampling Methods and Survey Bias

What is misleading about this graph?
**choose the best answer

• Nothing is misleading about this graph.

• The democrats are too high.

• The y-axis does not start at zero, so it makes the democrats look much higher than the other two parties.

Why do we randomly select our samples?

• to control every aspect

• reduce bias

• so we don't get the same answers from everyone

• because it is easier to do

Tags

CCSS.HSS.IC.B.3

When analyzing data, how can bias affect the results of a survey?

• It ensures all data is accurate.

• It makes the sample more representative of the population.

• It can lead to misleading conclusions by over-representing certain groups.

• It eliminates the need for a random sample.

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CCSS.HSS.IC.B.3

Which is the best survey question to gather data?

• What do you think about homework?

• How much time do you spend on homework daily?

• Do you do your homework regularly?

• Why do students have homework?

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CCSS.HSS.IC.B.3

You want to find out the average number of hours students in your school spend doing homework each week. Which sampling method is best?

• Surveying 25 students in your homeroom class

• Surveying 100 students from one subject only

• Surveying 50 randomly selected students from all grade levels

• Surveying 200 students who are in the library after school

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

A group of students records the number of hours they spend on the phone each day: 2, 5, 7, 7, and 30. Which statement about the data is correct?

• The outlier is 30, which makes the mean larger than most of the data values.

• The outlier is 2, which makes the median smaller than the mean.

• The outlier is 30, which has no effect on the data’s range.

• There is no outlier because all values are part of the data set.

How does a random sample help reduce bias in a survey?

• It guarantees equal responses from all groups.

• It ensures each member of the population has an equal chance of being selected.

• It automatically increases the size of the population being surveyed.

• It removes the need for data organization.

Tags

CCSS.HSS.IC.B.3

A sample of 50 students is chosen to represent a school population of 800 students. What is the best way to determine if the sample is representative?

• Check if students were selected randomly from different grades and groups.

• Ensure the sample includes all students from one grade.

• Confirm the sample has the same number of boys and girls.

• Make sure the sample includes students with similar hobbies.

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

A boxplot is the best graphical representation of a data set when:

• There are multiple modes in the data set.

• The data set includes an outlier that affects the spread.

• The data is entirely categorical.

• The data set is small and contains no extreme values.

A data set shows the weekly screen time of students: 3, 5, 7, 7, 50 hours. What is the effect of the outlier (50 hours)?

• It decreases the median.

• It increases the mean.

• It has no effect on the mode.

• It reduces the range.