Please read my previous post before reading this post as it s linked together.
Today was biz stats class test. As usual, I was defeated by the word 'carelessness' again. 2nd time for 2 consecutive Fridays. Is it really bad Friday whenever there are tests? Nope, blame it on me carelessness.
Sorry for the jargon because I may use some biz stats terms which some of you may not understand.
All went well for parts 1a) to 1d). As for part e) I sensed a mistake once I finished the paper. Part e) was the last question by the way. Why did I sensed something wrong? That was because I got a probability of 0.3830 (38.3%) as my answer. Normally, it will be 90 plus percent all less than 10 percent. Weird answer. Cant figure why. It was after I handed out the paper when I realised my mistake.
Normally, we find standard error of mean from the standard deviation and substitute in the value to find the z-value. However, I carelessly substituted the standard deviation to find the z-value. Damn. This will cost me 2 to 3 marks or maybe 4 or 5 marks depending on how strict the marker is.
If only I was not careless, I will not make a mistake in substitution and also, made a mistake in the stock card for FA test. All this boils down to one word: Carless. Had to really change this bad habit or it will cost me more marks in the main examinations. :(
