Question

O.O someone help!!!
In 2010, babies born after a gestation period of 32 to 35 weeks had a mean weight of 2600 grams and a standard deviation of 660 gram. In the same year, babies born after a gestation period of 40 weeks had a mean weight of 3500 grams and a standard deviation of 470 grams. Suppose a 34-week gestation baby weighs 2400 grams and a 40-week gestation period baby weighs 3300 grams.

What is the z-score for the 34-week gestation period baby? What is the z-score for the 40-week gestation period baby? Which baby weighs less relative to the gestation period?

Answer 1

If you can't then its ok, as long as you tried

Answer 2

In 2010, babies born after a gestation period of 32 to 35 weeks had a mean weight of 2600 grams and a standard deviation of 660 gram.

In the same year, babies born after a gestation period of 40 weeks had a mean weight of 3500 grams and a standard deviation of 470 grams.

Suppose a 34-week gestation baby weighs 2400 grams and a 40-week gestation period baby weighs 3300 grams.

This is personally how id set it up. but i honestly havnt done this stuff in a few years. Maybe @KlOwNlOvE OR @satellite73 OR @Donblue22 Maybe could help you

Answer 3

Ok, thanks for trying

Answer 4

Sorry cant help :/

Answer 5

Welcome. But those people might be able to help you. Better then me at math haha.

Answer 6

Satelite with check it out in a bit. He's busy i believe

Answer 7

I've thought to go to my professor tomorrow and ask him how to solve this damn question. He actually stutters a lot when explaining, that's why i don't understand but I'll see what I can do about it

Answer 8

Anyway, I'll just let it go for a while

Answer 9

http://www.pearsonhighered.com/sullivanstats4einfo/detail/sample-chapter/echapter/files/assets/basic-html/page57.html This maybe could help bro

Answer 10

Thx

Answer 11

@phi

Answer 12

babies born after a gestation period of 32 to 35 weeks had a mean weight of 2600 grams and a standard deviation of 660 gram.

simplify that to early_baby mean 2600 std 660

we are asked about a particular early baby
Suppose a 34-week gestation baby weighs 2400 grams

what is its z-score?

Answer 13

as you know (?) , we have a bell-shaped distribution centered about 2600 with a standard deviation of 660.

the question is asking, "how far from the mean are we ?"
in other words, what is the distance between 2400 (the baby's weight) and the average weight of "early babies".

you do know how to subtract?

the only "trick" is we measure this distance in how many standard deviations.
in other words, find the difference, then divide by 660

can you do that ?