A recent study examined the effects of carbon monoxide exposure on a group of construction workers. The following table presents the number odf workers who reported various symptoms, along with the shift (morning, evening or night) that they worked. Shift Morning Evening Night Influenza 16 13 18 Headache 24 33 6 Weakness 11 16 5 Shortness of Breath 7 9 9 a. Compute the expected frequencies under the null hypothesis. b. Compute the value of chi-square statistic. c. Test the hypothesis of independence. Use the a=0.05 level of significance. What do you conclude?
A recent study examined the effects of carbon monoxide exposure on a group of construction workers. The following table presents the number odf workers who reported various symptoms, along with the shift (morning, evening or night) that they worked.
Shift
Morning Evening Night
Influenza 16 13 18
Headache 24 33 6
Weakness 11 16 5
Shortness of Breath 7 9 9
a. Compute the expected frequencies under the null hypothesis.
b. Compute the value of chi-square statistic.
c. Test the hypothesis of independence. Use the a=0.05 level of significance. What do you conclude?
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