Sampling and Surveys 3.5

What is it called when some groups in the population are left out of the sampling process?

• nonresponse

• bias

• response bias

• undercoverage

What is it called when an individual chosen for the sample cannot be contacted or refused to participate?

• nonresponse

• bias

• response bias

• undercoverage

A nonsampling error occurs when someone gives an incorrect response to a sample survey. What is it called when a systematic pattern of incorrect responses occurs?

• nonresponse

• bias

• response bias

• undercoverage

Identify the type of bias: A flour company in Minnesota wants to know what percentage of local households bake at least twice a week.  A company representative calls 500 households during the daytime. 

• Convenience Sample
• Voluntary Response
• Undercoverage
• Wording

Identify the type of bias: Tim has decided to do a survey to find out the number of blue shirts people own.  He decides to ask people by texting them at 2 AM. 

• Convenience Sample
• Voluntary Response
• Undercoverage
• Wording

An opinion poll company in North Dakota sends out their surveyors to knock on doors in Fargo from 10 a.m. to 4 p.m. Which sampling design flaw best describes the scenario

• Convenience Sample

• Nonresponse

• Undercoverage

• none of the above

A news release for a diet-products company reports: "There's good news for the 65 million Americans currently on a diet." Its study showed that people who lose weight can keep it off. The sample was twenty graduates of the company's program who endorse it in commercials. The results of the study are probably

• biased, overstating the effectiveness of the diet.

• biased, understating the effectiveness of the diet.

• unbiased because these are nationally recognized individuals.

• unbiased, but they could be more accurate. A larger sample size should be used.

• biased, but it is hard to tell whether the results will overstate or understate the effects of the diet.

A local tax reform group polls the residents of the school district and asks the question, “Do you think the school board should stop spending taxpayers’ money on non-essential arts programs in elementary schools?” The results of this poll are likely to

• Underestimate support for arts programs because of undercoverage.

• Underestimate support for arts programs because of the way the question is worded.

• Overestimate support for arts programs because of undercoverage.

• Overestimate support for arts programs because of the way the question is worded.

• Accurately estimate support for arts programs.

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.A.1

CCSS.HSS.IC.B.3