I need to access Office 365 Sharepoint site statistics using Windows Powershell v3.0.

Statistics include:Number of visits to a site
Number of unique visits to a site
Content volume of site

Is there a question here?

If you're looking for prewritten scripts, you can check the repository:

http://gallery.technet.microsoft.com/scriptcenter

If not, post your script and your errors and we can help you from there.

I am able to get reports using Office 365 popularity trends but I want to get the same reports using Powershell script i.e. cmdlets or CSOM objects or maybe some API calls.

I am able to get reports using Office 365 popularity trends but I want to get the same reports using Powershell script i.e. cmdlets or CSOM objects or maybe some API calls.

That's still not a question.

We aren't going to write something for you, if that's what you're looking for.

Note that the reports are web applications.  I do not see where they are exposed to PowerShell.  THe dta being reported is from te log files.  Youcan write code to parse the logs on standalone SharePoint but I do not think you can on O365.

Post in O365 forums as they may know of tools to get these logs.

Here are the SP online docs for PowerShell:

https://technet.microsoft.com/en-us/library/fp161388.aspx

Note that the reports are web applications.  I do not see where they are exposed to PowerShell.  The data being reported is from the log files.  You can write code to parse the logs on standalone SharePoint but I do not think you can on O365.

Post in O365 forums as they may know of tools to get these