Sampling (CP Stats 3.1-3.3)

An example of convenience sampling is:

• asking students about dismissal times in school by surveying students as they enter the student parking lot.

• ask people to click a link to a survey online.

• pick every third person from a list of people to be surveyed.

• can only be done at a Circle K store.

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Click all that are true about a simple random sample.

• A SRS gives every group of a specified amount of individuals an equal chance to be selected as the sample.

• An SRS gives every individual in a population a chance to be selected more than once.

• The SRS can be chosen using a random number generator.

• The SRS can be selected using slips of paper.

Tags

CCSS.HSS.IC.B.3

Why do we randomly select our samples?

• for control
• reduce bias
• so we don't get the same answers from everyone
• to eliminate confounding results

Tags

CCSS.HSS.IC.B.3

A teacher wants to know the average time spent doing homework by the students in her class of 20 girls and 5 boys.
She selects the first five who raise their hands.

• Systematic
• Convenience
• Voluntary Response
• Simple Random

Tags

CCSS.HSS.IC.B.3

What is a synonym for the word variability?

• differences

• similarities

• fairness

• accuracy

Tags

CCSS.RI.11-12.4

CCSS.RI.8.4

CCSS.RI.9-10.4

CCSS.RL.11-12.4

CCSS.RL.9-10.4

A dot plot with high variability will have elements or dots...

• close together

• spread out

• clustered at the maximum

• peaking at 5

Tags

CCSS.6.SP.A.2

When x̅ differs from sample to sample, we say this is an example of

• variability among the samples

• bias among the samples

• not having large enough sample sizes

• poor survey techniques

Fred wants to determine the mean hourly wage of the working students at his school. He asks thirty of his friends their hourly wage and calculates the sample mean to be $6.  Is this random or biased sampling?

• Random
• Biased

Tags

CCSS.HSS.IC.B.3

Ms. Madson wants to know how many students will attend the next 7^th grade after school dance.  She places all the 7^th grade students’ names in a jar and selects 50. Is this random or biased sampling?

• Random
• Biased

Tags

CCSS.HSS.IC.B.3

Match the graphs with the descriptions listed.

• Low Bias, High Variability

• C

• High Bias, Low Variability

• A

• High Bias. High Variability

• B

• Low Bias, Low Variability

• D