The resulting degree of freedom is
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The average hospitality girls working in a certain area is 19 years old. A civic oriented group made a recent survey on the age of the hospitality girls working in the same locality. A random sample of 20 respondents showed an average of 15.4 years old with a standard deviation of 2.14 years old. Using a 0.05 level of significance, has the hospitality girls gone lower?
The resulting degree of freedom is:
a. 20-1
b. 20
c. 20-2
d. none of the above
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