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View Poll Results: What year were you born?
1901-1924 1 2.17%
1925-1942 6 13.04%
1943-1960 24 52.17%
1961-1979 11 23.91%
1980-1998 4 8.70%
1999-2017 0 0%
Voters: 46. You may not vote on this poll

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Old 10-24-2017   #11
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Originally Posted by aam1234 View Post
Which video. Care to link
https://youtu.be/mXB4DSgBLbg
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Old 10-27-2017   #12
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Didn't expect that there would be more from the 1943 to 1960.
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Old 10-27-2017   #13
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No surprise there. That age group encompasses most of the baby boomers, including me, who are approaching or have reached retirement age. These people have more time to travel and engage in hobbies than the full-time workers who comprise a greater fraction of the younger age groups.
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Old 10-27-2017   #14
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No surprise there. That age group encompasses most of the baby boomers, including me, who are approaching or have reached retirement age. These people have more time to travel and engage in hobbies than the full-time workers who comprise a greater fraction of the younger age groups.
The grouping is based on generations.
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Old 10-27-2017   #15
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I was wondering how the not-quite-equal class intervals were chosen.
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Old 10-27-2017   #16
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[Side question, if I may]

I'm asked by my department at work to do a survey. I had a discussion with my boss about the size of the sample we should do to give us a good representation of what the employees think about that subject.

So my question is, out of, say 1,000, how many I should survey (sample size) to give us a good idea about that subject.
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Old 10-27-2017   #17
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I'm asked by my department at work to do a survey. I had a discussion with my boss about the size of the sample we should do to give us a good representation of what the employees think about that subject.

So my question is, out of, say 1,000, how many I should survey (sample size) to give us a good idea about that subject.
That depends upon what you consider a "good representation." For most published polls, and for each question that can be answered in only two ways, e.g., yes/no or true/false, the pollsters typically get between 1,000 to 3,000 answers. Unless the answers are overwhelmingly one way or the other, and if the sample is truly random and some factor is not biasing the results - you would be surprised how difficult it is to design and implement a proper poll! - the pollster has a 95 percent chance of getting between 1.8 to 3.1 percentage points of the true result. If you want to have a 95 percent chance of getting within 100E percentage points of the actual number, the formula for the number of responses n that you need is at least (the symbol ≥ is the mathematician's way of saying "at least")

n ≥ 0.96 / EČ responses.

For example, if you want within ten percentage points of the correct value, E would be 0.1 and EČ, i.e., e multiplied by itself, would be 0.01. This works out to be that n must be at least 96 responses. If you get responses from 96 people and the response comes in at half and half or thereabouts, you then have a 95 percent chance that the actual percentage will be within ten percentage points of the percentage you got experimentally. If you are willing to be only 90 percent confident that your percentage is within your estimated interval, you can let that 0.96 in the formula slide to 0.68 and get by with about one third fewer responses. It should be pointed out that the 95 percent confidence level is pretty standard and the minimum acceptable for dissemination to the general public and if you go to the lower standard, you had better say so loudly and clearly lest you find your job at risk.

Also take heed of my warning about keeping unconscious bias out of your poll. News organizations have come some really infamous croppers that way, such as the widespread predictions that the 2016 election for President of the United States would go to Hillary Clinton. You really, really don't want to be the guy to predict something like that! I don't know how available the book How to Lie with Statistics by Darrel Huff is in your country, but it is short, easy to read, and almost entirely nonmathematical. The examples date from 1954 so are so out-of-date as to be funny; nevertheless, the point should come through.
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Old 10-29-2017   #18
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`

Quote:
Originally Posted by Mary Walter View Post
Didn't expect that there would be more from the
1943 to 1960.
News flash: Expect that of any broad-interest/hobby group.
Or of many other age surveys ... cuz of simple fact of the
huge fertility bulge in those years. Surely, you've heard of
the "boomers" ? Thaz them, right there
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Old 10-29-2017   #19
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The pig-in-a-python effect from the baby boom is now dissipating. The 1946-1964 Baby Boomer are beginning to die off and is not nearly big enough by itself to account for the large peak shown in the data of this survey. Here is the age distribution of U.S. residents as of 2016 from the Census bureau:

American FactFinder - Results
https://factfinder.census.gov/faces/...html?fpt=table
Retrieved October 29, 2017

Age Distrubution of United States Residents - 2016
Total...........................Male............Fe male
10 to 14 years 6.4% +/-0.1 6.7% +/-0.1 6.2% +/-0.1
15 to 19 years 6.7% +/-0.1 6.9% +/-0.1 6.4% +/-0.1
20 to 24 years 6.9% +/-0.1 7.2% +/-0.1 6.6% +/-0.1
25 to 29 years 7.0% +/-0.1 7.2% +/-0.1 6.8% +/-0.1
30 to 34 years 6.7% +/-0.1 6.9% +/-0.1 6.6% +/-0.1
35 to 39 years 6.5% +/-0.1 6.5% +/-0.1 6.4% +/-0.1
40 to 44 years 6.1% +/-0.1 6.2% +/-0.1 6.1% +/-0.1
45 to 49 years 6.5% +/-0.1 6.5% +/-0.1 6.4% +/-0.1
50 to 54 years 6.8% +/-0.1 6.7% +/-0.1 6.8% +/-0.1
55 to 59 years 6.7% +/-0.1 6.6% +/-0.1 6.8% +/-0.1
60 to 64 years 6.1% +/-0.1 5.9% +/-0.1 6.3% +/-0.1
65 to 69 years 5.2% +/-0.1 5.0% +/-0.1 5.4% +/-0.1
70 to 74 years 3.7% +/-0.1 3.5% +/-0.1 3.9% +/-0.1
75 to 79 years 2.6% +/-0.1 2.3% +/-0.1 2.8% +/-0.1
80 to 84 years 1.8% +/-0.1 1.5% +/-0.1 2.1% +/-0.1
85 years and over 1.9% +/-0.1 1.4% +/-0.1 2.5% +/-0.1

Source: U.S. Census Bureau, 2016 American Community Survey 1-Year Estimates
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Old 11-02-2017   #20
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That depends upon what you consider a "good representation." ...
Thank you very much for the effort, Allen (or is it Allan, always get confused. English is not my first language as you know). Regardless, really really value your answer


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