I frequently commit this spelling mistake. Analyzed is the correct spelling as per US English. Most of the time, I write it as Analysed. This is wrong in US English. However this is the correct spelling in UK English. So, if you are communicating in US English, then you need to follow the first one. Analyzing is also for Analysing in US English.
When I tried to type Opinion today, three time I typed Openion . First, I doubt on the spelling after 2 minutes, and then moved to Orkut scrapbook page (I need a text area on Firefox to check spellings by it's inbuilt spell checker). Then I came to know that I made that mistake. After that also, I tried to type it 2 more times, and typed Openion instead of Opinion , but this time I caught it while typing, before finishing the word.
Comments
I believe it's follow ???
I also believe that the 'z' is the correct original English spelling, but due to the popularity of it in America, Microsoft assumed that we must use 's' not 'z'.
Similar to how Apple thinks that British calendars start on a Monday even though they traditionally start on a Sunday (due to the fact that we're also a Christian country).