1. Estimated idle time of a fork lift truck is 40%. Relative accuracy desired = +/- 10%; Desired confidence level = 95%. How many observations (n) are required?
2. The estimated percent of people wearing sweaters is 40%. Relative accuracy desired is +/- 20%. Desired confidence level is 68%. How many observations (n) are required?
3. An estimated percentage of overcast days is 25%. Relative accuracy desired is +/-5%. The desired confidence level is 95%. How many observations (n) are required?