# Myocardial Infarction Status

Given the following 2x2 table:

Myocardial Infarction Status

Yes No

OC User 683 2537

Non-OC user 1498 8747

Calculate the expected value for an OC user and no myocardial infarction. The TA said "2537", which may be correct, but I think some kind of chi-square goodness of fit or a similar test is needed to see what the "expected value" would be or how it would fit a normal distribution. I have waded through some reference material that would indicate there is a way to solve for the expected value, given the sample, but am unclear on how to work this.

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#### Solution Preview

The table looks like this:

Myocardial Infraction Status

YES NO

OC User 683 2537

Non-OC User 1498 8747

Let me first state the solution in general terms and then apply numerical values. add extra column and row for the sum values

Myocardial Infraction Status

YES NO Subtotal

OC User a1 a2 (a1+a2)

Non-OC User b1 b2 ...

#### Solution Summary

A myocardial infarction status is examined. The expected value for an OC user are given.