Exercise: Eye colour and sex

The following table shows eye colour, as recorded by another student, for a group of male and female biomedical sciences, medical, nursing, physiotherapy, and radiography students:

Eye colour Sex Total
female male
black 6 4 10
brown 47 32 79
blue 27 17 44
grey 10 1 11
hazel 9 5 14
green 16 4 20
other 4 1 5
missing 1 0 1
Total 120 64 184

Eye colour	Sex	Total
female	male
black	6	4	10
brown	47	32	79
blue	27	17	44
grey	10	1	11
hazel	9	5	14
green	16	4	20
other	4	1	5
missing	1	0	1
Total	120	64	184

Questions

1. We did this in week 1, but, just for revision, what kind of variable is eye colour? What kind of variable is sex?

Check suggested answer 1.

2. What methods could we use to test the null hypothesis that observed eye colour in not related to sex?

Check suggested answer 2.

3. How would you choose between these methods to test the null hypothesis that observed eye colour in not related to sex?

Check suggested answer 3.

4. Which method would you choose to test the null hypothesis that observed eye colour in not related to sex?

Check suggested answer 4.

5. How would you interpret the result P = 0.3?

Check suggested answer 5.

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Last updated: 23 July, 2006.