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anonymous

  • one year ago

A sample of 168 individuals is selected, and the individuals are classified according to their smoking habits and the smoking habits of their parents. The results are given in the contigency table below. What is the relative frequency of individuals in the sample who have two parents who do not smoke?

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  1. anonymous
    • one year ago
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  2. kropot72
    • one year ago
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    First you need to find the totals of the values in the 2 rows and the 3 columns of the contingency table. Then you divide the total number of individuals who have parents neither of which smoke by 168.

  3. anonymous
    • one year ago
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    well I did 168 divided by 18 and got 9.33333 because that is the only family who doesnt smoke

  4. anonymous
    • one year ago
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    I mean 47 my bad hold on

  5. anonymous
    • one year ago
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    I got 3.57

  6. anonymous
    • one year ago
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    ok sratch that I got 2.5 because I added 47 and 23

  7. kropot72
    • one year ago
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    When I added the number of individuals who smoke, but have both parents non-smokers (23 individuals) to the number of individuals who don't smoke and who have both parents non-smokers (47 individuals) I get the following: 23 + 47 = 70 The relative frequency of individuals in the sample who have two parents who do not smoke is then given by: \[\large \frac{70}{168}= this\ fraction\ needs\ simplifying\]

  8. anonymous
    • one year ago
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    yeah and I got 5/12

  9. kropot72
    • one year ago
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    Correct!

  10. anonymous
    • one year ago
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    wait! @kropot72 there is no option to simply, I need to round my answers to a decimal.

  11. Vocaloid
    • one year ago
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    all you need to do is put 5/12 into a calculator, and it'll give you 5/12 in decimal form

  12. kropot72
    • one year ago
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    What he said. ^^^^^

  13. kropot72
    • one year ago
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    @atlantaslast How many decimal places are required in the answer?

  14. anonymous
    • one year ago
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    two decimals places.

  15. kropot72
    • one year ago
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    Then you will need to round up in this case.

  16. anonymous
    • one year ago
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    how would that be? I just guessed and put 4.1 because it said 0.4166666

  17. anonymous
    • one year ago
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    but it might be 1.6

  18. kropot72
    • one year ago
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    Not really. ).416666666 rounded to two decimal places is 0.42.

  19. anonymous
    • one year ago
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    so the answer would be 0.42?

  20. kropot72
    • one year ago
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    Correct.

  21. anonymous
    • one year ago
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    Thanks :)

  22. kropot72
    • one year ago
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    you're welcome :)

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