What is the difference between だいたいand たいてい?Feel free to just provide example sentences.

I was also curious about the difference so I looked it up: http://detail.chiebukuro.yahoo.co.jp/qa/questio...

Here's a summary of what it says:
- You use たいてい when you're describing the likelihood of something, i.e. when something is 80%-90% likely to be, based on previous experience or knowledge. It is usually used when there's a condition involved.
Ex.: 雨(あめ)がふると、彼(かれ)はたいてい欠席(けっせき)だ. When it rains, he is usually (たいてい) absent from class. The condition here is "when it rains".
Ex.: たいていの日本人(にほんじん)は、みそしるが好(す)きだ. Most (たいてい) Japanese people like Miso soup. The condition here is "being a Japanese person".
- You use だいたい when there's no relation to past knowledge/experience.
Ex.: きょうは、１日(にち)じゅうだいたい晴(は)れでしょう。傘(かさ)はいらないと思(おも)います。It will be mostly (だいたい) clear today. I don't think you'll need an umbrella.
"Mostly clear" doesn't describe likelihood, so たいてい can't be used.
- だいたい is also used to mean "about / approximately", たいてい is not used this way.
Ex: きょうのパーティには、だいたい何人(なんにん)ぐらいお客(きゃく)さんが来(き)ますか. To today's party, approximately (だいたい) how many guests will arrive?
- When unsure, use だいたい, it will be understood

Turned out longer than I expected... hope it helps!

I saw this site hope it helps.
https://www.italki.com/discussion/112165

Personally ,I use だいたい for percentages or numbers.
Ex. だいたい20%くらい。
だいたい5人くらい。

たいてい is used for something very frequently
Ex. 彼はたいてい家にいる。