A statistician in a small town wishes to determine if persons treated for an acc

Question

A statistician in a small town wishes to determine if persons treated for an accident involving a joint injury were more likely to go to an orthopedist or a chiropractor. In the small town, there is only one orthopedist and one chiropractor. The orthopedist saw 118 people for joint injuries in one year. The chiropracter saw 83.

1. The degrees of freedom for this Chi Square problem are?

a) 1

b) 2

c) 5

d) 200

2. The derived Chi Square value for Problem 1 is

a) 3.94

b) 1.09

c) 5.69

d) 6.09

3. The conclusion for Problem 1 would be

a) people preferred the orthopedist significantly more at p < .02

b) people preferred the orthopedist significantly more at p < .001

c) people preferred the chiropractor more at p < .05

d) there was no significant difference between the two according to people's preference

Explanation / Answer

1 )degrees of freedom for this Chi Square problem =number of categoires -1 =1

2)

derived Chi Square value = 6.09

3)a) people preferred the orthopedist significantly more at p < .02

observed Expected Chi square Type Probability O E=total*p =(O-E)^2/E orthopaedist 1/2 118.000 100.50 3.05 chiropractor 1/2 83.000 100.50 3.05 1 201 201 6.0945

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