stats help needed...

- anonymous

stats help needed...

- jamiebookeater

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- anonymous

##### 1 Attachment

- anonymous

i need help with part A

- anonymous

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

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- anonymous

- anonymous

- anonymous

like what is the next step? i have the zscore and i have the graph drawn out (68-95-99.7)

- bahrom7893

You look it up in the z-table. Sorry I'm bad at stat, hang around while help comes.

- anonymous

- bahrom7893

- bahrom7893

- phi

look in you z table for the area above -0.966 std dev.
it looks like about 83 %

- anonymous

can you show me the work? im confused on the last steps

- anonymous

like how would i solve it without using Excel or something like that

- phi

You would use a z-table or calculator
Do you use a table ?

- anonymous

i dont know what a z table is to be frank

- 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

this is the first one like this on my hw

- phi

your book must talk about how to do this?

- 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

any way this can be done on a graphing calc rather than on this site?

- 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

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

do u get it?

- 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

http://www.tutor-homework.com/statistics_tables/statistics_tables.html

- anonymous

check this tables

##### 1 Attachment

- anonymous

do u see -0.97 ?

- anonymous

yes i get that by doing the formula for z score and rounding

- anonymous

do u see the value that correspond to it ?

- anonymous

not really no. i dont get how that part works.

- anonymous

|dw:1348601547745:dw|
the deshes represents some numbers on the table ;right

- anonymous

yeah. i just dont know how i get this table to see the probability.

- 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

do u follow?

- anonymous

yes i get that. i dont know how to get that table though.

- anonymous

what do you mean you dont know how to get the table?

- anonymous

do u mean u don't have the table

- anonymous

yes

- anonymous

check the attechement skbmt it has tables

- anonymous

##### 1 Attachment

- anonymous

@mariomintchev mahlatse posted them

- anonymous

thanks

- anonymous

u r welcome

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