# Thread: Hypothesis - please help

1. ## Hypothesis - please help

Could you please help me answer this question on Hypothesis

Blue Green Grey Brown
UV 0 23 27 19 33
UV 1 35 16 20 20
UV 2 30 26 15 23
UV 3 54 23 21 15

data set contains the results of scientific tests performed on a sample of 400 inhabitants of Transylvania, who were selected at random from the population of that region. Eye colour was classified as follows: blue; green; grey; brown. Reaction to controlled exposure of ultraviolet light at a given fixed intensity was classified as follows:

uv0 = mild reaction;
uv1 = moderate reaction;
uv2 = severe reaction;
uv3 = extremely severe reaction.

Consider the following pair of hypotheses:

H0: ultraviolet light sensitivity is independent of eye colour ;
H1: ultraviolet light sensitivity is not independent of eye colour .

Using a suitable hypothesis test - based on the above hypotheses, and performed at the 5% significance level - on your individual dataset, investigate the independence of the eye colour of a Transylvanian and their reaction to ultraviolet light.
Your answers to parts (a),(b) and (c) should be given correct to three decimal place
(a). Enter the critical value:
(b). Enter the expected frequency (under the assumption that the null hypothesis is true) for the cell (UV0,Brown):
(c). Enter the value of the test statistic:
(d). Select the hypothesis test decision, based on your answers to parts (a) and (c): reject or dont reject H0?

2. ## Re: Hypothesis - please help

What specifically are you having trouble understanding? I don't feel that it would be justified for me to just do the problem, but perhaps I can help you understand it better.