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anonymous

  • one year ago

**MEDAL/FAN A study of five hundred adults found that the number of hours they spend on social networking sites each week is normally distributed with a mean of 14 hours. The population standard deviation is 3 hours. What is the margin of error for a 95% confidence interval? 0.134 0.220 0.263 0.313

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  1. anonymous
    • one year ago
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    @ganeshie8 @pooja195 @Michele_Laino

  2. Michele_Laino
    • one year ago
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    please wait, I'm pondering...

  3. anonymous
    • one year ago
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    Yes okay

  4. Michele_Laino
    • one year ago
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    a 95% confidence interval, means an error of: \[\Large \frac{{1.96\sigma }}{{\sqrt {500} }} = \frac{{1.96 \times 3}}{{\sqrt {500} }} = ...?\]

  5. Michele_Laino
    • one year ago
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    I got that number: 1.96, using my tables of the "erf" function

  6. Michele_Laino
    • one year ago
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    N=500 is the size of your sample

  7. anonymous
    • one year ago
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    5.88 ---- 22.36067977

  8. Michele_Laino
    • one year ago
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    yes!

  9. anonymous
    • one year ago
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    0.2629615942

  10. Michele_Laino
    • one year ago
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    that's right!

  11. anonymous
    • one year ago
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    Can u help me with this? A coach wants to know if football players who warm up before a game will score more points than those who don't warm up. He will break the team up into two groups and make sure each player gets equal time on the field. He will then count how many points each player makes during the game. What statistic should he study? The mean number of points earned by each player The mean number of points earned by each group The standard deviation of the number of points earned by each player The standard deviation of the number of points earned by each group

  12. Michele_Laino
    • one year ago
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    I think the last option

  13. Michele_Laino
    • one year ago
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    since the coach is searching for an average value for player

  14. anonymous
    • one year ago
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    Okay thanks!

  15. anonymous
    • one year ago
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    Can you help me with one last question? Crunchy Potato Chip Company has two different manufacturing plants. Company officials want to test whether each plant fills the bags with the same number of ounces. A random sample of potato chip bags from plant A had a mean of 24.2 ounces in each bag. A random sample from plant B had a mean of 22.2 ounces. They randomized the data over 100 trials and the difference of means for each trial is shown in the dot plot below. What can Crunchy Potato Chip Company conclude from this study?

  16. anonymous
    • one year ago
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    Options: The difference is not significant because a difference of 2.0 is very likely. The difference is not significant because a difference of 2.0 is not very likely. The difference is significant because a difference of 2.0 is not very likely. The difference is significant because a difference of 2.0 is very likely.

  17. Michele_Laino
    • one year ago
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    I'm pondering...

  18. Michele_Laino
    • one year ago
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    I think the second option, since we have no outcomes whose difference is 2 ounces

  19. anonymous
    • one year ago
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    Thank you :)

  20. Michele_Laino
    • one year ago
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    please wait

  21. Michele_Laino
    • one year ago
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    I confirm my answer

  22. anonymous
    • one year ago
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    Okay

  23. Michele_Laino
    • one year ago
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    If your problem is searching for a difference 2, in absolute value, then we have to consider also the result -2.0

  24. Michele_Laino
    • one year ago
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    in that case the right option is option A, since outcomes for a difference about -2.0 give a low probability

  25. anonymous
    • one year ago
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    Oh okay! Thank you very much :)

  26. Michele_Laino
    • one year ago
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    thanks! :)

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