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Aqualungx

  • one year ago

Suppose that a travel bureau claims that the trees in a forest are 83 feet tall on average, with a standard deviation of 2 feet. If you took a sample of 64 trees, which of the following mean heights would be outside the 95% confidence interval? A. 83.2 feet B. 83.4 feet C. 82.8 feet D. 83.6 feet

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  1. anonymous
    • one year ago
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    Do you know how to solve for your error margin?

  2. phi
    • one year ago
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    this is the same problem as your "customer service" problem, but with different numbers

  3. anonymous
    • one year ago
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    So given: That the the sample mean is 83 The error margin is 1.96^2 / Squa*64 -> Which gives = 0.49 Approximately Now the range is from 83 - 0.49 < u < 83 + 0.49

  4. aqualungx
    • one year ago
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    I got 82.51, 83.49

  5. UnkleRhaukus
    • one year ago
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    those aren't in the multiple choice

  6. aqualungx
    • one year ago
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    yes I know one second

  7. aqualungx
    • one year ago
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    I think it would be 83.2?

  8. UnkleRhaukus
    • one year ago
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    |dw:1433333812983:dw|

  9. UnkleRhaukus
    • one year ago
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    |dw:1433334016477:dw|

  10. aqualungx
    • one year ago
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    They are both equally far apart

  11. UnkleRhaukus
    • one year ago
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    nope

  12. UnkleRhaukus
    • one year ago
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    |dw:1433334121303:dw|

  13. aqualungx
    • one year ago
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    Am I looking for the farthest away? since it says outside the 95% confidence interval

  14. UnkleRhaukus
    • one year ago
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    i don't know how to calculate the 95% confidence interval, but yes you are looking for the option that are furthest from the mean

  15. aqualungx
    • one year ago
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    so 83.6

  16. UnkleRhaukus
    • one year ago
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    if any of the options are correct yes that must be one of them, but if there are multiple correct options i cant be sure about 82.8 and 83.4, either they are both correct also or both incorrect

  17. aqualungx
    • one year ago
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    Okay thank you!

  18. UnkleRhaukus
    • one year ago
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    if we use @DelTaVsPi 's result :

  19. aqualungx
    • one year ago
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    Can you help me with one more?

  20. UnkleRhaukus
    • one year ago
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    |dw:1433334736084:dw|

  21. UnkleRhaukus
    • one year ago
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    i don't know stat.

  22. aqualungx
    • one year ago
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    The answer was right...

  23. UnkleRhaukus
    • one year ago
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    The answer is always right!

  24. aqualungx
    • one year ago
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    Lol

  25. aqualungx
    • one year ago
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    For the second question if you can help its which of the following is an example of replication A. Assigning test subjects to test groups arbitrarily B. performing five different studies of the same drug C. testing patients by giving them either a new drug or no drug D. studying the effects of both therapy and no therapy on students

  26. UnkleRhaukus
    • one year ago
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    the first option seems to define randomization and the last two options seam to be examples of a controlled experiment

  27. aqualungx
    • one year ago
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    So it would be B since repeating the same experiment on different people

  28. UnkleRhaukus
    • one year ago
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    makes the most sense, if the results for the 5 studies agree; these replicated results will be much stronger evidence

  29. aqualungx
    • one year ago
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    I dont know why I said people xD

  30. UnkleRhaukus
    • one year ago
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    People are everywhere!

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