Most email providers only allow up to 10mb as an attachment. Now, gmail and Yahoo supposedly allow up to 25mb. Here's the catch, the recipient must be able to have the same capabilities of send and receiving files that large too. If not, it's a no go. Anything large will have to be handled by a large file transfer website like toobigforemail.com or http://www.send-file.com
Compress
probably because the attachment is too large of a file 10mb is the max i think
samples may be used when the population size is too large for the experiment.
An envelope can never be too large for itself.
To view a large MP4 email attachment on an iPhone, you can tap the attachment in the email to begin downloading it. If the file is too large, the iPhone may prompt you to download it to your device or view it in a compatible app such as Apple Photos or Files. You can also consider saving the attachment to a cloud service like iCloud Drive or Google Drive for easier access. Ensure you have a stable internet connection, especially for larger files.
It might be too much.
Assuming you're using Apple's mail program - when you send an e-mail to a Windows user, when adding the attachment, there should be a small checkbox that you can check that says, "Send Windows Friendly Attachments". Make sure you check that box.
that you have a large variance in the population and/or your sample size is too small
a model
A filter or photo editing software is used to picture things that are too large or too small to be shown actual size. The image is modified in such a way that it can be viewed with the greatest ease.
No, it is too large
preferably one that is the correct size for the job, ie. not too large nor to small.