Using a confidence level of 99%, estimate the proportion of all spectators that travelled to the arena by car.
1. A random sample of 400 people attending a hockey game at Fort William Gardens reveals that 350 came by car. Using a confidence level of 99%, estimate the proportion of all spectators that travelled to the arena by car.
2. You are interested in conducting a study to determine the proportion of Thunder Bay high school students who have a desire to remain in Thunder Bay after they finish their schooling. How many students must be interviewed if you wish the estimate to be accurate within plus or minus 3 percentage points 92% of the time?
3. A random sample of 16 industrial firms in a city revealed a mean workforce of 30 with a standard deviation of 10 workers. What is the mean size of the workforce in all industrial firms if a probability level of 99% is used to construct the confidence interval?
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