Age 20-24 Age 25-29 Age 30-34 Yes 45 80 5 No 25 25 15 No response 25 10 55 What are two reasons a respondent might not answer this question? What are the strata in this sample? If a person is picked at random from the sample, what is the probability that they are age 25-29 or did not respond to this question?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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In a recent survey of a fair stratified random sample of the population, a question appeared as:
Italic text startDo you plan to vote in favour of the speed limit change? Yes/NoItalic text End
Italic text startA scientist found the following number of responses per stratum:Italic text End

  Age 20-24 Age 25-29 Age 30-34
Yes 45 80 5
No 25 25 15
No response 25 10 55
  1. What are two reasons a respondent might not answer this question? 
  2. What are the strata in this sample? 
  3. If a person is picked at random from the sample, what is the probability that they are age 25-29 or did not respond to this question? 
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If three people are picked at random from the sample, what is the probability that at least one did not respond to this question? Bold text start(

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