Question

For a z-score of 1.94, what is the probability of finding a higher z-score?

Answer 1

do you have access to a graphing calculator or a z-table?

Answer 2

yes

Answer 3

@AlexBabich

Answer 4

that is a good mathematical statement, but in real life you have to pick one so if you have both then i recommend the calculator.

Answer 5

I got 2.7

Answer 6

Am i correct?

Answer 7

no no no!

Answer 8

I dont want to be rude...

Answer 9

but one of the most important concepts in probability is...

Answer 10

your probability can only be between 0 and 1

Answer 11

its like a percentage you see...

Answer 12

the least percent sure of something you can be is 0% and the most sure you can be of something is 100%

Answer 13

for example say you get probability of .234 your percent chance of this happening is 23.4%

Answer 14

0.02619 is what I got from the z table

Answer 15

ahh ok so the answer you gave me was the percentage, but the question asks for probability so you must leave it in the decimal format.

Answer 16

okay

Answer 17

this is not correct what you gave me.

First is the table you have giving you the area to the right or to the left?

Answer 18

right

Answer 19

ok that is perfectly fine, you will get the area to the right of 1.94 and then take this result and subtract it from 1

Answer 20

so where does the table match up with 1.94?

Answer 21

the answer is correct

Answer 22

@Zarkon which one?

Answer 23

yours

Answer 24

.026189775534

Answer 25

Do i have to round?

Answer 26

that is up to your instructor

Answer 27

if you are using a table then use whatever digits it provides

Answer 28

Okay! Can you help me with other stats questions?

Answer 29

For a z-score of -1.65, what is the probability of finding a lower z-score?

Answer 30

0.04946 but since its negative the answer will be 0.04846. Right?

Answer 31

where did 0.04846 come from?

Answer 32

My apologies for discounting your answer. I was mistaken. Great Job :)

Answer 33

well since its negative i thought it would be 0.04846

Answer 34

the negative or positive doesnt matter so much. The most important thing is if its left or right. So if you find -1.65 in your table the number it matches up with is your final result.

Answer 35

you are correct!

Answer 36

negative values will have a probability less than .5 to the right. And positive values will have probability greater than .5 to the right

Answer 37

0.04846 is not correct

Answer 38

@Zarkon can you help me understand?

Answer 39

.049471450884

Answer 40

which is close to your first answer

Answer 41

I still don't know haw you got 0.04846

Answer 42

What happens to the negative