In the 2000 U.S. Census, the ages of individuals in a small town were found to be the following:

Less than 18 – 20%                  18-35 – 30%            and            greater than 35 – 50%

In 2010 the ages of 500 individuals from the same small town were sampled with the following results:

Less than 18 – 121 people       18-35 – 288 people    and          greater than 35 – 91 people

Using an alpha of 0.05, would you conclude that the population distribution of ages has changed in the last 10 years? Instructions for performing this test in Stat Disk can be found in the Stat Disk User’s Manual under Goodness of Fit, Unequal Frequencies.

1.    Complete the table as necessary.

[Hint: You will need to compute the observed frequencies based on the percentages for the 500 samples. Round to the nearest integer]

Less than 18 18-35 35 -91

————————————————————————————

Observed | 121 | 288 | 91

Observed | ? | ? | ?

Need help in determining the values marked by question(?) mark.

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