Quiz about Data Science - Unit 2 Review

Question 1

A February 2017 Gallup Poll question asked, "In politics, as of today, do you consider yourself a Republican, a Democrat, or an Independent?"

The possible responses were "Democrat", "Republican", "Independent", "Other", and "No Response".

What kind of variable is the response?

Accepted Answer

Categorical

Answer

Quantitative

Question 2

A pharmaceutical company conducts an experiment in which a subject takes 100 mg of a substance orally.

The researchers measure how long it takes for half of the substance to exit the bloodstream.

What kind of variable is the response?

Accepted Answer

Quantitative

Answer

Categorical

Question 3

A medical researcher measures the increase in heart rate of patients under a stress test.

What kind of variable is the response?

Accepted Answer

Quantitative

Answer

Categorical

Question 4

What type of sample:

Tony works for a political party. He stands at a busy street corner asking people whom they plan to vote for in the upcoming election.

Accepted Answer

Convenience Sample

Answer

Simple Random Sample

Answer

Stratified Sample

Answer

Cluster Sample

Answer

Systematic Sample

Question 5

What type of sample:

A mineral water company wants to find out why people choose a particular brand of mineral water. A mail-in response card is attached to the neck of every bottle of mineral water the company sells.

Accepted Answer

Voluntary Sample

Answer

Simple Random Sample

Answer

Stratified Sample

Answer

Cluster Sample

Answer

Systematic Sample

Question 6

What type of sample:

You intend to survey your school population to determine whether the students would like a dance in June. You obtain all the class lists and generate random numbers to identify who should be in your sample.

Accepted Answer

Simple Random Sample

Answer

Stratified Sample

Answer

Cluster Sample

Answer

Systematic Sample

Answer

Voluntary Sample

Question 7

What type of sample:

CEO Elle wants to know about employee satisfaction. She decides to survey a sample of 370 employees. She divides the employees into groups based on the floor they work in (there are many floors). Then she randomly selects 8 floors and then surveys all the employees on those floors.

Accepted Answer

Cluster Sample

Answer

Simple Random Sample

Answer

Stratified Sample

Answer

Systematic Sample

Answer

Voluntary Sample

Question 8

Is the following statement an accurate method to collect a simple random sample?

Governor Jen wants to know what percentage of residents in her state support a new tax law. Instead of asking all of the state's residents, she decides to survey a sample of 209 residents. She assigns a unique number to each resident. Then she uses a random number generator to select 209 residents for the sample.

Accepted Answer

Yes

Answer

No, it's stratified

Answer

No, it's cluster

Answer

No, it's systematic

Question 9

Is the following statement an accurate method to collect a simple random sample?

Marine biologist Allan wants to know about the health of coral colonies in the Lyra Reef. Instead of examining the entire reef, he decides to investigate a sample of 283 coral colonies. He randomly selects one coral colony from a list and then selects every 10th coral colony after that until 283 are selected.

Accepted Answer

No, it's systematic

Answer

Yes

Answer

No, it's stratified

Answer

No, it's cluster

Question 10

Is the following statement an accurate method to collect a stratified sample?

Marine biologist Kai wants to know about the health of coral colonies in the Tubbataha Reef. Instead of examining the entire reef, he decides to investigate a sample of 407 coral colonies. He divides the coral colonies into groups based on their depth. Then he chooses a random subset of coral colonies from each depth.

Accepted Answer

Yes

Answer

No, it's systematic

Answer

No, it's simple random

Answer

No, it's cluster

Question 11

Is the following statement an accurate method to collect a stratified sample?

Police chief Pete wants to know about the safety of the streets in his city. Instead of patrolling the entire city, he decides to investigate a sample of 469 streets. He divides the streets into groups based on traffic volume. Then he chooses a random subset of streets from each group.

Accepted Answer

Yes

Answer

No, it's systematic

Answer

No, it's simple random

Answer

No, it's cluster

Question 12

Is the following statement an accurate method to collect a systematic sample?

Governor Iain wants to know what percentage of residents in his state support a new healthcare law. Instead of asking all of the state's residents, he decides to survey a sample of 249 residents. He randomly selects one resident from a list and then selects every 10th resident after that until 249 are selected.

Accepted Answer

Yes

Answer

No, it's stratified

Answer

No, it's simple random

Answer

No, it's cluster

Question 13

Is the following statement an accurate method to collect a cluster sample?

Governor Eric wants to know what percentage of residents in his state support a new environmental law. Instead of asking all of the state's residents, he decides to survey a sample of 112 residents. He randomly selects one resident from a list and then selects every 14th resident after that until 112 are selected.

Accepted Answer

No, it's systematic

Answer

Yes

Answer

No, it's stratified

Answer

No, it's simple random

Question 14

Determine the type of bias:

If you survey only premium users of a streaming service about their experience, but not lower tier users, such as those with memberships with ads.

Accepted Answer

selection bias

Answer

confirmation bias

Answer

cherry picking

Answer

nonresponse bias

Answer

response bias

Question 15

Determine the type of bias:

A customer satisfaction survey might miss the views of dissatisfied customers who choose not to respond, skewing the results positively.

Accepted Answer

nonresponse bias

Answer

confirmation bias

Answer

cherry picking

Answer

selection bias

Answer

response bias

Question 16

Determine the type of bias:

During presidential elections, people tend to seek information that paints the candidate they support in a positive light, while dismissing any information that paints them in a negative light.

Accepted Answer

confirmation bias

Answer

cherry picking

Answer

selection bias

Answer

nonresponse bias

Answer

response bias

Question 17

Determine the type of bias:

A climate change skeptic cites several cold weather events as evidence against global warming, while disregarding the overwhelming scientific consensus and data indicating long-term temperature trends to convince senators not to pass a climate change bill.

Accepted Answer

cherry picking

Answer

confirmation bias

Answer

selection bias

Answer

nonresponse bias

Answer

response bias

Data Science - Unit 2 Review

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