Insurance companies are interested in knowing the population percent of drivers who always buckle up before riding in a car. They randomly survey 402 drivers and find that 312 claim to always buckle up. Construct a 80% confidence interval for the population proportion that claim to always buckle up. Use interval notation, for example, [1,5]
Insurance companies are interested in knowing the population percent of drivers who always buckle up before riding in a car. They randomly survey 402 drivers and find that 312 claim to always buckle up. Construct a 80% confidence interval for the population proportion that claim to always buckle up. Use interval notation, for example, [1,5]
Confidence intervals is an inference process which can be used to estimate the population parameter. The confidence interval gives the range of plausible values of the population parameter.
The standard error for the confidence interval of population proportion is given by . The confidence interval of the population proportion is , where is the sample proportion and is the critical z value corresponding to confidence level.
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