Question

Good Morning!!!
I need help me with 2 out of 3 Statistic questions...

I will appreciate, thanks. :))

Answer 1

it would be useful to us if we could know what the questions are; in order to determine if we are capable of helping out

Answer 2

Sorry, I thought that I attached the question..

Answer 3

you got a ti83? or other statistic calcultor/program?

Answer 4

or are you expected to utilize z tables?

Answer 5

Noo,they won't allow me to use. I have the Ti30x

Answer 6

then you this requires being able to interpret a ztable; and different authors use different setups which makes explaining it a little tough

Answer 7

i believe the only difference between a and b is the b is multiplied by sqrt(n); where n is 30 in this case

Answer 8

Yes I have to use the z table. I know how to do the first part.. but the second which is b) not sure what I am doing wrong..

Answer 9

part a:\[z=\frac{x-mean}{sd}\]

part b:\[z=\frac{x-mean}{sd}*\sqrt n\]

Answer 10

hold on let me see if I get it... Please

Answer 11

Ok, question. What happen if I got 7.41, How do I look I the table??

Answer 12

depends on the table :)

can you show me a picture of the ztable you are working with?

Answer 13

there should be a left side and a top side

the left side should read 7.4; and the top side .01 and where they intersect gives an area; and that area is what is different due to different authros

some read it from the mean, others from the left side

Answer 14

everything zscore over 3.9 from the mean can be approximated as .5000

Answer 15

Try this pages 5 and 6..
http://mathematics.gulfcoast.edu/Courses/STA2023/Stat.TablesandFormulas.PDF

Answer 16

ok, your tables measure everything from the left end; so you need the "3.9 and over" value: 9999

and subtract the -1.81 value to get the area inbetween them

Answer 17

So, I should look the -1.81 at the table??

Answer 18

7.41 is greater than 3.9; so everything above 3.9 is equal to .9999