The manager of a QFC is concerned that customers may think the store's temperature may be too warm. He uses a random number generator to pick 4 of the 23 aisles, and then asks all of the customers in those aisles whether they are comfortable.

What survey methodology is this?

The manager of a QFC is concerned that customers may think the store's temperature may be too warm. He uses a random number generator to pick 4 of the 23 aisles, and then asks all of the customers in those aisles whether they are comfortable.

A: Stratified Sampling
B: Clustered Sampling
C: Simple Random Sampling
D: Systematic Sampling


Answer: B

The manager of a QFC is concerned that customers may think the store's temperature may be too warm. He knows men and women may have different views, and also knows 60% of his customers are women. He asks a random 60 women and a random 40 men whether they are comfortable.

What survey methodology is this?

The manager of a QFC is concerned that customers may think the store's temperature may be too warm. He knows men and women may have different views, and also knows 60% of his customers are women. He asks a random 60 women and a random 40 men whether they are comfortable. 

A: Stratified Sampling
B: Clustered Sampling
C: Simple Random Sampling
D: Systematic Sampling


Answer: A

The manager of a QFC is concerned that customers may think the store's temperature may be too warm. He uses a random number generator to select customers at random and asks them whether they are comfortable.

What survey methodology is this?

The manager of a QFC is concerned that customers may think the store's temperature may be too warm. He uses a random number generator to select customers at random and asks them whether they are comfortable. 

A: Stratified Sampling
B: Clustered Sampling
C: Simple Random Sampling
D: Systematic Sampling


Answer: C

The manager of a QFC is concerned that customers may think the store's temperature may be too warm. He surveys every 10th customer that comes into the store and asks them whether they are comfortable, yes or no.

What survey methodology is this?

The manager of a QFC is concerned that customers may think the store's temperature may be too warm. He surveys every 10th customer that comes into the store and asks them whether they are comfortable, yes or no. 

A: Stratified Sampling
B: Clustered Sampling
C: Simple Random Sampling
D: Systematic Sampling


Answer: D

The manager of a QFC is concerned that customers may think the store's temperature may be too warm. He surveys every 10th customer after they leave and are getting into their cars whether they are warm enough.

What is wrong with this survey?

The manager of a QFC is concerned that customers may think the store's temperature may be too warm. He surveys every 10th customer after they leave and are getting into their cars whether they are warm enough. 

A: The wrong question
B: The wrong sampling frame
C: A biased sample


Answer: A

An amusement park opens a new roller coaster. It is so popular that people are waiting for up to 3 hours. The owners want to know how the visitors feel. They survey every 10th person in the line for the roller coaster, starting from a randomly selected individual.

What is wrong with this survey?

An amusement park opens a new roller coaster. It is so popular that people are waiting for up to 3 hours. The owners want to know how the visitors feel. They survey every 10th person in the line for the roller coaster, starting from a randomly selected individual. 

A: The wrong question
B: The wrong sampling frame
C: A biased sample


Answer: B

Lycos wanted to know what people thought about medical marijuana. They posted a question on the Lycos Website on 18 June 2000: Should marijuana be legally available for medical purposes?

What is wrong with this survey?

Lycos wanted to know what people thought about medical marijuana. They posted a question on the Lycos Website on 18 June 2000: Should marijuana be legally available for medical purposes? 

A: The wrong question
B: The wrong sampling frame
C: A biased sample


Answer: C

Fruit spoilage sampling at QFC - 20 kinds of fruit - What is it called if you pick up fruit and sample every 10th fruit?

Fruit spoilage sampling at QFC - 20 kinds of fruit - What is it called if you pick up fruit and sample every 10th fruit?

Answer: Systematic Sampling

Fruit spoilage sampling at QFC - 20 kinds of fruit 0 what is it called if you pick 5 of each of the 20 kinds of fruit?

Fruit spoilage sampling at QFC - 20 kinds of fruit 0 what is it called if you pick 5 of each of the 20 kinds of fruit?

Answer: Stratified sampling

Fruit spoilage sampling at QFC - 20 kinds of fruit - what is it called if you pick 3 kinds of fruit at random and check all the fruit for spoilage?

Fruit spoilage sampling at QFC - 20 kinds of fruit - what is it called if you pick 3 kinds of fruit at random and check all the fruit for spoilage?

Answer: Clustered Sampling