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mariomintchev

  • 3 years ago

stats help needed...

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  1. mariomintchev
    • 3 years ago
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  2. mariomintchev
    • 3 years ago
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    i need help with part A

  3. mariomintchev
    • 3 years ago
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    i dont know what to do after i get the z-score... which is -0.966 (when rounded)

  4. mariomintchev
    • 3 years ago
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    @estudier @myininaya @phi @sasogeek @Tyler1992

  5. mariomintchev
    • 3 years ago
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    @bahrom7893

  6. mariomintchev
    • 3 years ago
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    like what is the next step? i have the zscore and i have the graph drawn out (68-95-99.7)

  7. bahrom7893
    • 3 years ago
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    You look it up in the z-table. Sorry I'm bad at stat, hang around while help comes.

  8. mariomintchev
    • 3 years ago
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    @ash2326 @Jemurray3

  9. bahrom7893
    • 3 years ago
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    @amistre64 @satellite73

  10. bahrom7893
    • 3 years ago
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    @Libniz

  11. phi
    • 3 years ago
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    look in you z table for the area above -0.966 std dev. it looks like about 83 %

  12. mariomintchev
    • 3 years ago
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    can you show me the work? im confused on the last steps

  13. mariomintchev
    • 3 years ago
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    like how would i solve it without using Excel or something like that

  14. phi
    • 3 years ago
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    You would use a z-table or calculator Do you use a table ?

  15. mariomintchev
    • 3 years ago
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    i dont know what a z table is to be frank

  16. phi
    • 3 years ago
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    Here is a site that does the conversion http://www.tutor-homework.com/statistics_tables/statistics_tables.html How are you doing these problems?

  17. mariomintchev
    • 3 years ago
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    this is the first one like this on my hw

  18. phi
    • 3 years ago
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    your book must talk about how to do this?

  19. phi
    • 3 years ago
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    but to do a) select standard distribution (the first one shown) right tail type in -0.966 for z and have it calculate the area under the curve to the right of that z score. that is the chance the weight is above this z score

  20. mariomintchev
    • 3 years ago
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    any way this can be done on a graphing calc rather than on this site?

  21. phi
    • 3 years ago
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    if it knows about normal distributions (do they?) otherwise http://en.wikipedia.org/wiki/Normal_distribution#Numerical_approximations_for_the_normal_CDF is a (messy) way

  22. REMAINDER
    • 3 years ago
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    using normal since ur z score is -0.966 round to 2 decimal u'll have -0.97 it means u'll have P(z>=-0.97) because it is over 1050 u'll have 1-P(Z<=-0.97) on the z table -0.97 it hase the probability of 0.1660 now 1-(0.1660) 0.834 wich by conclusion is 83.4%

  23. REMAINDER
    • 3 years ago
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    do u get it?

  24. mariomintchev
    • 3 years ago
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    yeah i get everything except the part where i get the 0.1660. i dont know how to get it without using the site Phi gave me above. ^^^

  25. mariomintchev
    • 3 years ago
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    http://www.tutor-homework.com/statistics_tables/statistics_tables.html

  26. REMAINDER
    • 3 years ago
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    check this tables

  27. REMAINDER
    • 3 years ago
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    do u see -0.97 ?

  28. mariomintchev
    • 3 years ago
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    yes i get that by doing the formula for z score and rounding

  29. REMAINDER
    • 3 years ago
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    do u see the value that correspond to it ?

  30. mariomintchev
    • 3 years ago
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    not really no. i dont get how that part works.

  31. REMAINDER
    • 3 years ago
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    |dw:1348601547745:dw| the deshes represents some numbers on the table ;right

  32. mariomintchev
    • 3 years ago
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    yeah. i just dont know how i get this table to see the probability.

  33. REMAINDER
    • 3 years ago
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    to find this 0.1660 take -0.9 ignore negative (meaning u gonna take 0.9)then add it to 0.07 wich will give positive 0.97 from there where -0.9 intersects 0.07 is ypur probability

  34. REMAINDER
    • 3 years ago
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    do u follow?

  35. mariomintchev
    • 3 years ago
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    yes i get that. i dont know how to get that table though.

  36. Mahlatse1
    • 3 years ago
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    what do you mean you dont know how to get the table?

  37. REMAINDER
    • 3 years ago
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    do u mean u don't have the table

  38. mariomintchev
    • 3 years ago
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    yes

  39. REMAINDER
    • 3 years ago
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    check the attechement skbmt it has tables

  40. Mahlatse1
    • 3 years ago
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  41. REMAINDER
    • 3 years ago
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    @mariomintchev mahlatse posted them

  42. mariomintchev
    • 3 years ago
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    thanks

  43. REMAINDER
    • 3 years ago
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    u r welcome

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