for a bonus, here are these...
A survey of 210 registered voters revealed that 107 of them plan on voting for the incumbent. Find a 95% confidence interval for the proportion of all registered voters who plan on voting for the incumbent. Does it appear statistically valid to conclude that more than 50% of all registered voters plan on voting for the incumbent? Why or why not?
Suppose you want to estimate the percentage of registered voters who plan to vote for the incumbent and you want your estimate to be within 2 percentage points of the correct population measure, based upon a 95% confidence level. What minimum size sample is required? Assume that no estimate of "p-hat" is known.
This assignment is due by midnight. How long will it take you?>
P(x-bar > 4) = P(z > 5) ≈ 0
Since probability is almost 0, it would be unusual to find a sample of 16 stations with average price more than $4.00.
For this answer can you calculate out the 0