Several Years Ago the Proportion of Americans Aged 18-24 Who

Essay

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: $$\begin{array} { l l l l l } y e s & \text { no } & \text { no } & \text { yes } & \text { no } \\\text { no } & \text { yes } & \text { no } & \text { no } & \text { yes } \\\text { no } & \text { no } & \text { no } & \text { no } & \text { no } \\\text { no } & \text { no } & \text { no } & \text { yes } & \text { no } \\\text { no } & \text { no } & \text { yes } & \text { no } & \text { no }\end{array}$$ 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.