z scores explained more for statistics classes

[lajane123]

simple!



[Harleybabe95667]

when I look at my z table I see a value of 0.8413 for 1, not .34 which the last person saw as well. for -1 I see a value of 0.1587, very confused!

[statisticsfun]

@Harleybabe95667 Each table, in the back of your book is slightly different. What your table is telling you is all the area of the bell curve to the left of z = 1. This means that the area between the mean and 1 is .8413 - .5000. .5000 is the area from the mean to the far left side of the curve.

[statisticsfun]

@Harleybabe95667 Each table, in the back of your book is slightly different. What your table is telling you is all the area of the bell curve to the left of z = 1. This means that the area between the mean and 1 is .8413 - .5000. .5000 is the area from the mean to the far left side of the curve.

[statisticsfun]

@Harleybabe95667 I know this stuff can be really frustrating, so I created a video "Understanding Normalized Tables" I can't seem to add a link, but you can see my video on my channel statisticsfun.

[Brandonality]

BEST VIDEO. very clear. THANK, YOUUU!!!



[OvoJeGovno]

My left ear is lonely

[leotakesleo]

plz i need to know if mean is 2 and standard deviation is 0.2 then how we can get the z values for 8 intervals each with 1/8 gap.

in other others im given probabilities and i need to find z score...from table!

[statisticsfun]

@leotakesleo you have to solve for the sample mean. The equation is z score = (sample mean (x) - population mean (u) )/standard deviation. It may be easiest to start with a z score of 4 and work backwards. So if I divide up 0 to 4 at .5 then I will get 8 intervals. The z scores become (.5, 1, 1.5, 2, 2.5, 3, 3.5, 4). Now solve for the sample mean at each z score.

.5 = (x - 2)/.2 ; x = 2.1

1 = (x -2)/.2 ; x - 2.2

1.5 = (x-2)/2 ; x =2.3

and so it goes....

[memphisdime88]

I have problem: my mean is 500 and the standard deviation is 100, and trying find where the percentage falls above 550...i dont understand

[TimmysMummy]

simple and clear... sooo useful. Thankyou very very much. x

[namanp]

right speaker 

[whitedaisez]

under 1 in my z score table has 0.8s not 0.3s. can someone plz help. nobody explains how to get this 0.34!

[statisticsfun]

@whitedaisez

There is a table in the back of your book usually called a normalized table or a normal probabilities. .34 is the area between the mean and 1 standard deviation away. z scores are standard deviations. So 1 z score is 1 standard deviation away.

[statisticsfun]

@whitedaisez I know this stuff can be really frustrating. I created a video on my channel statisticsfun "Understanding Normalized Tables" that would help you. I can't seem to add a link to the video.

[PunoDeTierra]

Thank you

[andreaj6]

this was easier to understand than hearing my prof explain it

[rbd7]

Thanks that was great :)

[brashboy0403]

it has been said before, but brilliant

thank you so much

[shun236]

This is the most straight forward version of this I've seen. No b.s. and no hard to understand accents

[lisaisbizness]

Thank you, thank you, thank you!!!

[daddylench]

thanks

[DontTouchMyMilk]

thanks dude!

[PrayersforMJackson]

Super!

[shibamatachick]

Brilliant, sir. Thanks a lot.