There is a table called the z-table that contains proportions between the mean and any given z-score. I have a calculator that does it, too (not sure if it is currently available because of the change in Google Drive). You should be able to find one readily online, however. Good luck
Because the proportions are the same both above and below the mean, you can use the same technique for either. For example, the proportion for z = -1.23 is the same as the proportion for z = +1.23
Yes...because the score is above the mean, you add .3944 to .5000 (50% of the scores are below the mean) to get the .8944. Some z tables do all of that math for you, others show you the distance from the mean to a z score and let you do the math.
The .3413 is the proportion of scores between the mean and the first SD in a normal curve. Try googling "normal curve with proportions" and see if you can find one that shows the proportions. You could also find the proportions in a z table. Good luck
In the course Google Drive folder, I have a spreadsheet about the Normal Curve. It includes a z table, plus some tools to find proportions under the curve. Look in the description of an video to find the link to the folder. Good luck,
Yes !!! There are many and that's not really explained very well (nor is Stats in general!!), but the 2 most common are: 1 - CUMULATIVE There are 2 tables to this type. One with Positive values to the left column, and the other with Negative values to the left column. **TIP - The "Positive" tables top left value starts with "0.5000" (This type is referenced in this video) 2 - CUMULATIVE TO THE MEAN Usually only One table with Positive values to the left column. **TIP: This tables top left value starts with "0.0000" Both (and all) table types require different equation treatments to get an accurate answer, but the most common ones above with either the 0.0005 vs 0.0000 positive starting value helped me immediately know what type of equation I had to use. Hope that helps.
Yes, Bling Girl is exactly right. The z tables are often structured differently. Some are designed to fit on a single page while others span multiple pages. Some use more or fewer decimal places. The answers/values should be pretty close until you go out to multiple decimal places.
I do not understand, how did you manage to get the z score to .3944?
Thanks very much I was sleepy when this was being discussed now I get it
Thank you for teaching this to us, you're awesome🧡
please explain, how did you solve for .3414, is there any table that we can find this value?
There is a table called the z-table that contains proportions between the mean and any given z-score. I have a calculator that does it, too (not sure if it is currently available because of the change in Google Drive). You should be able to find one readily online, however. Good luck
Thank you for the idea. I get it.
How did you get the ones above because you only showed how to get the ones below
Is it the same as below?
Because the proportions are the same both above and below the mean, you can use the same technique for either. For example, the proportion for z = -1.23 is the same as the proportion for z = +1.23
How did you get .3944. On the z table 1.25 = 0.8944. Kindly clarify. Thanks
Yes...because the score is above the mean, you add .3944 to .5000 (50% of the scores are below the mean) to get the .8944. Some z tables do all of that math for you, others show you the distance from the mean to a z score and let you do the math.
where did u get .3413 please🥺
The .3413 is the proportion of scores between the mean and the first SD in a normal curve. Try googling "normal curve with proportions" and see if you can find one that shows the proportions. You could also find the proportions in a z table. Good luck
z=1.25 has a corresponding area of .3944 but -1.25 is not.
I'm confused 😖
How can I read a z table?
In the course Google Drive folder, I have a spreadsheet about the Normal Curve. It includes a z table, plus some tools to find proportions under the curve. Look in the description of an video to find the link to the folder. Good luck,
Is it true that not all Z tables are alike? I've found several that does not match my book "Essential Medical Statistics"
Yes !!! There are many and that's not really explained very well (nor is Stats in general!!), but the 2 most common are:
1 - CUMULATIVE
There are 2 tables to this type. One with Positive values to the left column, and the other with Negative values to the left column.
**TIP - The "Positive" tables top left value starts with "0.5000" (This type is referenced in this video)
2 - CUMULATIVE TO THE MEAN
Usually only One table with Positive values to the left column.
**TIP: This tables top left value starts with "0.0000"
Both (and all) table types require different equation treatments to get an accurate answer, but the most common ones above with either the 0.0005 vs 0.0000 positive starting value helped me immediately know what type of equation I had to use.
Hope that helps.
Yes, Bling Girl is exactly right. The z tables are often structured differently. Some are designed to fit on a single page while others span multiple pages. Some use more or fewer decimal places. The answers/values should be pretty close until you go out to multiple decimal places.
TLDR?
Show us the table 😢
What Z-table us being used here?!? This is extra confusing urgh...no thank you