Fifty years ago, only 10% of state population consisted of people older than 70 years old....
Fifty years ago, only 10% of state population consisted of people older than 70 years old. A researcher plans to use a sample of n = 500 people to determine whether the population distribution has changed during the past fifty years. If a Chi-square test is used to evaluate the data, what is the expected frequency for the older-than-70 years old category?
A. 20
B. 30
C. 40
D. 50
E. None of the above.
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Fifty years ago, only 10% of state population
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