Biased Sampling

To evaluate the defect rate of its memory chips, an integrated circuit manufacturer tests every 100th chip off the production line.

• Biased Sample

• Unbiased Sample

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

A real estate agent surveys people about their housing preferences at an open house for a luxury townhouse.

• Biased Sample

• Unbiased Sample

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.4

To determine the most popular children’s programs, a television station asks parents to call in and complete a phone survey.

• Biased Sample

• Unbiased Sample

Tags

CCSS.7.SP.A.1

Airline boarding passes are marked with red stars at random to decide which passengers should have their carry-on luggage inspected.

• Biased Sample

• Unbiased Sample

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

To determine how often people eat out, every tenth person entering a Chinese restaurant is surveyed.

• Biased Sample

• Unbiased Sample

Tags

CCSS.HSS.IC.B.3

To determine the most common injury cared for in an emergency room, a reporter goes to the same hospital every afternoon for one month during the summer and observes people entering the emergency room. She concludes that second degree sunburn is the most common injury.

• Unbiased

• Biased

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

To evaluate customer satisfaction, a grocery store gives double coupons to anyone who completes a survey as they enter the store. The store manager determines that customers are very satisfied with their shopping experience in his store.

• Unbiased

• Biased

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.A.2

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.4

Carlos wants to know the favorite sport of people at his school so he asks his baseball team.

• Biased

• Unbiased

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2

A homeowner divides their backyard into 5 sections, and randomly removes soil from sections.

• Biased

• Unbiased

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2

A public library asked every 10th person who entered to name the type of book they were getting.

• Biased

• Unbiased

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3