Blood Type (a) and Disease

A physician was concerned that a particular disease was manifest in a way that was different than normal blood types.

The distribution of blood types by percentage of the total population is as follows:

O - 42%

A - 40%

B - 12%

AB - 5%

In the 187 patents the physician has seen, the patients are distributed in the following way:

O - 67

A - 83

B - 29

AB - 8

Does the blood type of the patents being seen by this physician differ from the general population?

1. Restate question as a research hypothesis and a null hypothesis about the populations.

Population 1:

Population 2:

Research hypothesis:

Null hypothesis:

2. Determine the characteristics of the comparison distribution.

3. Determine the cutoff sample score on the comparison distribution at which the null hypothesis should be rejected.

4. Determine your sample's score on the comparison distribution.

5. Decide whether to reject the null hypothesis.