SIT Chapter One

The entire group of individuals to be studied is called:

• Sample

• Population

• Individual

• Statistic

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A subset of the population that is being studied is called the:

• Population

• Sample

• Convenience sample

• parameter

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The state Department of Transportation wants to know about out-of-state vehicles that pass over a toll bridge with several lanes. A camera installed over one lane of the bridge photographs the license plate of every tenth vehicle that passes through that lane.

Identify the population and sample in this setting.

• The population is all out-of-state vehicles. The sample is the vehicles that pass over the bridge.

• The population is all of the vehicles that pass over a toll bridge. The sample is vehicles from the lane with the camera.

• The population is all of the vehicles that pass over a toll bridge. The Sample is every tenth vehicle that passes through that lane.

• Don't know, don't care.

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A parameter is a numerical summary based on a sample.

• True
• False

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A statistic is a numerical summary of a population.

• True
• False

Why is convenience sampling not a valid method of sampling?

• Convenience sampling is always cost-effective and efficient.
• Convenience sampling can lead to biased results and does not represent the entire population.
• Convenience sampling ensures a diverse representation of the population.
• Convenience sampling is the most accurate method of sampling.

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Identify the source of Bias: When a research company polls residents about their voting intentions, new California residents are under-represented.

• Response bias

• Sampling Bias

• Non-response Bias

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Samples of the population should be _______ of the population.

• Representative

• Suggestive

• Independent

• Respectful

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What is the purpose of a "sample" in research?

• To represent the entire population
• To provide background information
• To generalize findings to a larger population
• To select the target population for a study

Identify the Sample: The Huddle House wants to know if their customers buy dessert when they eat out. As people leave the restaurant one evening, 20 people are surveyed at random. Eight people say they usually order dessert when they eat out. The manager at Huddle House concluded that most customers do not order dessert. What is the SAMPLE in this scenario?

• 20 customers from Huddle House

• All customers from Huddle House that evening

• 8 customers from Huddle House

• The employees from Huddle House

Answer explanation

The sample in this scenario is the 20 customers from Huddle House who were surveyed. This group represents the customers' opinions on dessert orders, allowing the manager to draw conclusions about the larger customer base.

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