Stats, literally the killing machine!

Tonight in Stats class, we were doing the chapter probability .. oh I know most of you think it’s easy, because you have done it so shush! Anyways all of it was going smoothly, you know we were talking about set of all outcomes, sample space, probability of outcome, events and than independent events, different approaches to probabilities and interpreting them, and than different events like mutually exclusive events etc. and when we reached to the topic of conditional probability – suddenly the boat was in a storm, all of us were like huh and staring at teacher’s face. Although he tried to explain it and some of us got it and the boat went on. When it came to do the exercise question most of us were fighting the already lost war. Anyways 6.30 question went par and the boat crashed at 6.33. Lemme tell you what they were ..

A restaurant chain routinely surveys customers and among other questions asks each customer whether he or she would return and to rate the quality of food. Summarizing hundreds of thousands of questionnaires produced this table of joint possibilities.

So far it was okay and than there was a table with rating (good bad or whatever) and than two columns; one, customer is going to return and the other one was, the customer is not going to return.

It went well.

Now part a reads and I quote .. “What proportion of customers say that they will return and rate the restaurant’s food as good?” and the answer was 35, but it wasn’t that bad – but wait the plot thickens and the music is widening up.

Part b says, and I quote .. “What proportion of customers who say that they will return rate the restaurant’s food as good?” and part c says, ” What proportion of customers who rate the restaurant’s food as good say that they will return?”

So the titanic sank and the words killed us (mind you that I mean figuratively) ..!

I hope and I pray that I will win the mighty battle against Stats.

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