Kindle book -- book cover dimention

Hello,

I'm sorry for the trouble you had getting your new cover image to appear on the website.

I reviewed your cover image and found that its dimensions are outside our recommended size. For ideal conversion results, we recommend resizing the image to fit within 1600 x 2560 pixels.

Before you upload your resized cover image, you'll also want to make sure that it meets these guidelines:
- Minimum dimensions of 1000 pixels in height and 625 pixels in width.
- Minimum 72 dpi (dots per inch)
- RGB color profile
- An ideal height/width ratio of at least 1.6:1

After you upload your resized cover image and click the publish button, the changes will take effect on the website within 72 hours.

For more details about our image requirements, see our Help page:
http://kdp.amazon.com/help?topicId=A2J0TRG6OPX0VM

You can also choose to use our Cover Creator tool and select an image from our stock gallery. For details about Cover Creator, see our Help page:
https://kdp.amazon.com/help?topicId=A1DHGMW609HBI8

Thanks for using Amazon KDP.

Excel function to do a t-test

I did the following in Excel.  Row 3 contained results for the treatment group.  Row 4 had results for the comparison group.  F columns had group averages.  J columns had standard errors.

Statistical test
Column N

Average score difference

Column O

Pooled standard error

T-value (absolute value) If t-value greater than 1.96 (alpha=5%)
=F4-F3 =SQRT( ( (J3*J3) / G3 ) + ( (J4*J4 ) / G4 ) ) =ABS(N3/O3)  *