Sampling Methods

Data are collected on the 35 students in a college history course. Which of the following is not a variable for the data set?

• Student Address

• Student Age

• Student Political Affliation

• Number of Students in the Sample

A local ice-cream shop sells ice-cream cones for $2.00, and customers can choose from the following options.

Ice-cream flavor

Type of cone: sugar or waffle

Chocolate dipped for an additional $0.50

Sprinkles for an additional $0.50

Which of the following is a quantitative variable?

• Ice-cream flavor

• Type of cone

• Chocolate dipped or not

• Sprinkles or not

• The total cost of the cone

State the type of survey.

In order to estimate the percentage of defects in a recent manufacturing batch, a quality control manager at Intel selects every 8^th chip that comes off the assembly line starting with the 3^rd, until she obtains a sample of 140 chips.

• Systematic Random Sample

• SRS

• Cluster

• Stratefied Random Sample

State the type of sample.

In order to determine the average IQ of ninth-grade students, a school psychologist obtains a list of all schools in the local public school system. She randomly selects five of these schools and administers an IQ test to all ninth-grade students at the selected schools.

• Stratified Random Sample

• Cluster Sample

• SRS

• Random Sample

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.4

Determine the type of sample.

A member of Congress wishes to determine her constituency’s opinion regarding estate taxes. She divides her constituency into three income classes: low-income households, middle-income households, and high-income households. She then takes a random sample of households from each income class

• Cluster Sample

• Stratified Random Sample

• Convenience Sample

• SRS

State the type of sample.

In an effort to identify whether an advertising campaign has been effective, a marketing firm conducts a nationwide poll by randomly selecting 200 individuals from a list of known users of the product.

• Convenience Sample

• Voluntary Response Sample

• Census

• Cluster Sample

State the type of sample.

A radio station asks its listeners to call in their opinion regarding the use of American forces in peacekeeping missions.

• Voluntary Response Sample

• Cluster Sample

• Convenience Sample

• Stratified Random Sample

Tags

CCSS.HSS.IC.B.3

A political polling group is interested in learning about the proportion of registered voters who favor a particular candidate for mayor. Which of the following sampling plans may have introduced bias?

• Individuals were selected randomly to participate from a list of registered voters.

• Every 50^th person on a list of registered voters was contacted and asked to identify who they would vote for in the upcoming election.

• A list of registered voters was first separated into two lists—one of males and one of females. Then individuals were selected at random from each of the two lists.

• A survey was mailed to all registered voters and those who returned the survey make up the sample

• None of the above sampling plans creates the potential for bias.

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

Which of the following doesn’t result in some form of bias?

• Choosing AP students to survey regarding their GPA in order to estimate the average GPA in a school.

• Polling a group of potential voters outside a Republican campaign office in order to estimate the proportion of city residents who favor a particular candidate.

• Surveying people who work in the marketing department of a large corporation in order to assess employee satisfaction with management policies.

• Choosing a stratified random sample of juniors and seniors at a high school in order to estimate the proportion of juniors and seniors who plan to go on to college.

• Asking shoppers leaving a grocery store if they think groceries should cost less in order to estimate the proportion of city residents who think groceries cost too much.

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

A department store mails a customer satisfaction survey to people who make credit card purchases at the store. This month, 45,000 people made credit card purchases. Surveys are mailed to 1000 of these people, chosen at random, and 137 people return the survey form. Identify the population and the sample.

• P: 45,000 people who made credit card purchases.

  S: 137 returned surveys.

• P: 1,000 people that made credit card purchases who received a survey

  S: 137 returned surveys.

• P: 45,000 people who made credit card purchases.

  S: 1,000 people that made credit card purchases who received a survey

• P: All people who that have made credit card purchases.

  S: 1,000 people that made credit card purchases who received a survey