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Author Question: A bag contains 5 blue marbles and 25 red marbles. What are the odds of choosing a blue marble? A) ... (Read 85 times)

abern

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on: Aug 2, 2018
A bag contains 5 blue marbles and 25 red marbles. What are the odds of choosing a blue marble?
 
  A) 4 : 5 B) 5 : 4 C) 5 : 1 D) 1 : 5

Question 2

A market researcher obtains a sample of 50 people by standing outside a store and asking every 20th person who enters the store to fill out a survey until she has 50 people.
 
  What sampling method is being used here? Will the resulting sample be a random sample? Will it be a simple random sample? Explain your thinking.


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CharlieArnold

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Reply #1 on: Aug 2, 2018
Answer to Question 1

D

Answer to Question 2

This is systematic sampling. The sample obtained will be a random sample because everyone has the same chance of being chosen but will not be a simple random sample as different samples of 50 people have difference chances of being chosen.


abern

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Reply #2 on: Aug 2, 2018
Both answers were spot on, thank you once again


CharlieArnold

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Reply #3 on: Aug 2, 2018
Great! Please up vote :D


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