pr.probability – Estimation of required number of experiments with binomial destribution

Suppose you have an experiment that consists of several tests that return either “success” or “failure”. The longer you wait the more tests you can perform, but with limited time devising a condition of when do you have enough data is important.

Another question is if its even possible to gather enough data for a stable result in a reasonable timeframe.

  • We assume the tests are independent from one another.
  • Success rate is quite low (~0.001 to 0.01)
  • We perform two different sets of similar tests (anything said above applies to both, but the probability of success for tests from different sets can vary)
  • $N_1, N_2$ stand for amount of tests in two sets, while $n_1, n_2$ — for amount of successes.
  • Example — $N_1=N_2=2000, n_1=15, n_2=5$.

The main question is how likely is it that both sets of tests have same, or at least similar success rate.

My first idea was to use binomial distribution with probability of success taken from one of the sets $p=frac{n_1}{N_1}$ and arbitratily choose a cutoff measured in amount of standard deviations between norm and actual results of second set for when we can assume the second set can have the same success rate.

It works sort of alright for my needs, but obviously says nothing about data verification and I’m still in darkness on whether it is actually a correct method to tackle the problem.

networking – What DNS records are required to configure web hosting for a subdomain?

I’ve browsed several questions about DNS setup for subdomains and not quite found an answer, so I’m hoping you can assist.

Our domain name ( is registered with one provider (NetRegistry), and our main web site is now hosted by SquareSpace (configured using a CNAME record). We need to set up a separate, simple web hosting service with another provider using a subdomain (

I was originally advised that we could use their nameservers, and so created NS records for the subdomain with our registrar using the zone management tool available through their control panel. This didn’t work, though. Speaking to the hosting provider, I was advised to add an A name record for the subdomain pointing to a specific IP address for the new site, which I’ve also done. But throughout this process the subdomain has not resolved; I get a failure when using nslookup, as though it’s not recognised anywhere.

Currently we have both the A and NS records for the subdomain on our registrar, and I suspect we should only have one or the other; is that the case? I’m rusty with DNS and didn’t think this would be complicated, but if anyone can advise what records should be sufficient to for setting this up, I’d appreciate it.

ipados – iPad 2 activation required and failed (out of nowhere, not activation lock)

I have an iPad 2 and out of nowhere it requires an activation. It is connected to my WIFI and I did not have to enter my Apple ID.

The activation however fails, and it tells me to connected it to iTunes. When I connect it to my laptop it tries to activate it but also fails. I’ve tried it for a week now and came to the conclusion that this is some kind of software bug. The error message is (translated):

Your iPad could not be activated because the activation server is temporarily unavailable. Try to activate it with iTunes or try again in a couple of minutes.
If the problem persists talk to the apple support.

I tried to restart it and do a shutdown. I can’t restore it since on the laptop it goes strait to the failed activation message.

I know this device is fairly old but I use it every now and then. It was working just fine before this. Also the apple stores are currently closed where I live due to COVID. Does anyone have any ideas?

seo – What schema is required to make video game images appear on google carousel

If you search for “video games” in Google USA, google displays a title “Video games” and a scrollable carousel of games and their images.

What schema/product type needs to be configured into my website to make it theoretically possible to display my games on that scroller.

It seems that this code does not work:

<div itemscope itemtype="" 
  <meta itemprop="operatingSystem" content="Any">

linux – Is there a technical reason why rebooting is required to use a Displayport-to-VGA adapter?

I manage servers and prefer to use VGA as graphics quality is unimportant and VGA is ubiquitous on crash carts. I’d prefer to have a single video cable on the carts, and I can think of no more common connector.

Occasionally I find a server with no VGA or DVI output, just DisplayPort, or perhaps DisplayPort + HDMI.

I have a couple DisplayPort-to-VGA adapters. But they seem to only work if the computer is rebooted. That’s no good. Half the time I connect a monitor up to a server it’s because something has gone wrong, and I need to investigate the current state of the system. Having to reboot erases that state and some evidence of the problem.

I think that I could leave these adapters in the servers, one per and that would let me walk up with a vga monitor and plug in. But that’s impractical as well to have a bunch of dongles hanging out everywhere.

Is there a technical reason a fresh reboot is required to get vga output through a DisplayPort-to-VGA adapter?

Operating Systems tend to be linux distros. I’m wondering if the “thing” that the TTY’s attach to simply does not exist until the DisplayPort-to-VGA adapter is inserted. And the TTYs start at boot time, not dynamically. So that would tell me I need to write a udev script or something to detect insertion of displayport adapter and spawn a tty on it. Though that would probably fall short of displaying printk’s and such, much like using a usb-to-vga “adapter”.

But I didn’t think these little DP-to-VGA adapters had a frame buffer for instance, like the usb ones do.

My ideal solution would be some sort of kernel parameter to set in grub that would pre-initialize the DP port to serve as a VGA output. I tried this one to no avail:

gui design – Position of “required” asterisk in forms

Typically I would agree it makes more sense grammatically to be at the end of the text, especially if you have a footnote that denotes the meaning of the asterisk. For example:

enter image description here

However, I would not be so adamant to say that it must be done this way. There are benefits to having the asterisk at the start. Such as that it will be the first thing the user sees when scanning the label text.

If your only concern is the alignment, then it doesn’t have to be part of the label text. You could show if in a separate column of it’s own so that alignment is preserved. For example:

enter image description here

This second option in fact opens it up for the asterisk to be replaced by an icon if desired. As you can imagine, an icon would most certainly only work by having a dedicated column to the left…

enter image description here

NOTE: I am not for a second suggesting using that icon/colour for a required field. it’s just an example. Although perhaps you could use those icons when the user submits the form to alert them to something they have missed.

In summary, I don’t think there is a fixed rule to follow. The main thing is to ensure clarity to the user, and as a UX designer, find solutions to potential problems such as the left-align concern (which you are correct to highlight). As I have hopefully demonstrated, both options can be made to work with the right design.

Also, sometimes you just have to accept who gets to make the final decision and do your best to work with that decision even if you don’t agree with it.

gui design – Position of “required” star in forms

Recently got into a heated discussion with my product manager about the placement of a star * used for required fields in forms. He claims it must be positioned before the word, I say it must be at the end. Text aligned to the left and * on the left breaks this alignment. Google showing me both cases.

What are your thoughts about it and what is the best practice?

sharepoint server – Custom Solutions Upgrade is required from SP 2013 to SP 2016?

Hai have SharePoint 2013 Content database required to upgrade to SharePoint 2016,
I started now the Test Upgrade

SP 2013 Farm has deployed Custom Solutions that was targeted to .Net Framework 4.5 my question is when i take backup and deploy in Test SP 2016 farm is these farm solutions works?
Sp2013 Solutions is required to upgrade that SharePoint 2016 built on Microsoft .NET Framework version 4.6?