Suppose that the insurance companies did do a survey. They are interested in the population proportion of drivers who claim they always buckle up with 95% confidence. Their estimate must be accurate within 2% of the true proportion. i. If no preliminary estimate is available, find the minimum sample size required. i. Find the minimum sample size needed if they randomly surveyed 400 drivers and found that 320 claimed they always buckle up.

MATLAB: An Introduction with Applications
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Suppose that the insurance companies did do a survey. They are interested in
the population proportion of drivers who claim they always buckle up with 95%
confidence. Their estimate must be accurate within 2% of the true proportion.
i.
If no preliminary estimate is available, find the minimum sample size
required.
ii. Find the minimum sample size needed if they randomly surveyed 400
drivers and found that 320 claimed they always buckle up.
Transcribed Image Text:Suppose that the insurance companies did do a survey. They are interested in the population proportion of drivers who claim they always buckle up with 95% confidence. Their estimate must be accurate within 2% of the true proportion. i. If no preliminary estimate is available, find the minimum sample size required. ii. Find the minimum sample size needed if they randomly surveyed 400 drivers and found that 320 claimed they always buckle up.
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