anonymous
  • anonymous
stats help needed...
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
1 Attachment
anonymous
  • anonymous
i need help with part A
anonymous
  • anonymous
i dont know what to do after i get the z-score... which is -0.966 (when rounded)

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More answers

anonymous
  • anonymous
@estudier @myininaya @phi @sasogeek @Tyler1992
anonymous
  • anonymous
@bahrom7893
anonymous
  • anonymous
like what is the next step? i have the zscore and i have the graph drawn out (68-95-99.7)
bahrom7893
  • bahrom7893
You look it up in the z-table. Sorry I'm bad at stat, hang around while help comes.
anonymous
  • anonymous
@ash2326 @Jemurray3
bahrom7893
  • bahrom7893
@amistre64 @satellite73
bahrom7893
  • bahrom7893
@Libniz
phi
  • phi
look in you z table for the area above -0.966 std dev. it looks like about 83 %
anonymous
  • anonymous
can you show me the work? im confused on the last steps
anonymous
  • anonymous
like how would i solve it without using Excel or something like that
phi
  • phi
You would use a z-table or calculator Do you use a table ?
anonymous
  • anonymous
i dont know what a z table is to be frank
phi
  • phi
Here is a site that does the conversion http://www.tutor-homework.com/statistics_tables/statistics_tables.html How are you doing these problems?
anonymous
  • anonymous
this is the first one like this on my hw
phi
  • phi
your book must talk about how to do this?
phi
  • phi
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
anonymous
  • anonymous
any way this can be done on a graphing calc rather than on this site?
phi
  • phi
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
anonymous
  • anonymous
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%
anonymous
  • anonymous
do u get it?
anonymous
  • anonymous
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. ^^^
anonymous
  • anonymous
http://www.tutor-homework.com/statistics_tables/statistics_tables.html
anonymous
  • anonymous
check this tables
anonymous
  • anonymous
do u see -0.97 ?
anonymous
  • anonymous
yes i get that by doing the formula for z score and rounding
anonymous
  • anonymous
do u see the value that correspond to it ?
anonymous
  • anonymous
not really no. i dont get how that part works.
anonymous
  • anonymous
|dw:1348601547745:dw| the deshes represents some numbers on the table ;right
anonymous
  • anonymous
yeah. i just dont know how i get this table to see the probability.
anonymous
  • anonymous
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
anonymous
  • anonymous
do u follow?
anonymous
  • anonymous
yes i get that. i dont know how to get that table though.
anonymous
  • anonymous
what do you mean you dont know how to get the table?
anonymous
  • anonymous
do u mean u don't have the table
anonymous
  • anonymous
yes
anonymous
  • anonymous
check the attechement skbmt it has tables
anonymous
  • anonymous
anonymous
  • anonymous
@mariomintchev mahlatse posted them
anonymous
  • anonymous
thanks
anonymous
  • anonymous
u r welcome

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