A speed training program was effective in improving the 40-y…
A speed training program was effective in improving the 40-yard sprint times of high school athletes. A study of 500 high school athletes was conducted to estimate p, the true proportion of all high school athletes who attained improved sprint times after participating in the speed training program. The study showed that 425 of the 500 athletes had improved sprint times. Perform the calculations needed to determine if the sample size of n = 500 is large enough for large-sample confidence interval procedures to be valid. Is the sample size large enough?