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Question
Several years ago the proportion of Americans aged 18 " 24 who invested in the stock market was 0.20. A random sample of 25 Americans in this age group was recently taken. They were asked whether or not they invested in the stock market. The results follow:| yes | no | no | yes | no |
| no | yes | no | no | yes |
| no | no | no | no | no |
| no | no | no | yes | no |
| no | no | yes | no | no |
At a .05 level of significance, use Excel to determine whether or not the proportion of Americans 18 " 24 years old that invest in the stock market has changed.
Answer
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