z scores explained more for statistics classes
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All Comments (24)
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BEST VIDEO. very clear. THANK, YOUUU!!!
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My left ear is lonely
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@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....
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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!
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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
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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!
Harleybabe95667 1 week ago
@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 1 week ago
@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 1 week ago
@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.
statisticsfun 1 week ago
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!
whitedaisez 1 year ago
@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.
statisticsfun 1 week ago