# Confidence interval for population proportion

Confidence Intervals for Population Proportions

5.The new Twinkle bulb is being developed to last more than 1000 hours. A random sample of 100 of these new bulbs is selected from the production line. It was found that 64 lasted more than 1000 hours. Find the point estimate for the population proportion, the margin of error for a 95% confidence interval and then construct to the 95% confidence interval for the population proportion

a. Find the margin of error E =

b. Construct a 95% confidence interval for the population proportion p of all Twinkle bulbs =

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Confidence Intervals for Population Proportions

5.The new Twinkle bulb is being developed to last more than 1000 hours. A random sample of 100 of these new bulbs is selected from the production line. It was found that 64 lasted more than 1000 hours. Find the ...

#### Solution Summary

The solution provides step by step method for the calculation of confidence interval for population proportion . Formula for the calculation and Interpretations of the results are also included.