6. Three years ago Speedy Oil Change randomly surveyed 300 of their customers nationwide. (We will...

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6. Three years ago Speedy Oil Change randomly surveyed 300 of their customers nationwide. (We will assume this was less than 5% of their customers nationwide.) In the survey 249 of the participants said they were satisfied with the wait time for their oil change. Calculate a 95% confidence interval estimate of the true proportion of customers who were satisfied with the wait time. (Round each number to two decimal places.) 7. Write a sentence to interpret the interval you created in #6. 8. Using the interval from #6, calculate the point estimate and margin of error for the interval. (2 decimal places) Point Estimate = Margin of Error =. 9. You decide to conduct another nationwide survey to compare the current results to the study from 3 years ago. What sample size should you use if you want to be within 4 percentage points with 95% accuracy? 6. Three years ago Speedy Oil Change randomly surveyed 300 of their customers nationwide. (We will assume this was less than 5% of their customers nationwide.) In the survey 249 of the participants said they were satisfied with the wait time for their oil change. Calculate a 95% confidence interval estimate of the true proportion of customers who were satisfied with the wait time. (Round each number to two decimal places.) 7. Write a sentence to interpret the interval you created in #6. 8. Using the interval from #6, calculate the point estimate and margin of error for the interval. (2 decimal places) Point Estimate = Margin of Error =. 9. You decide to conduct another nationwide survey to compare the current results to the study from 3 years ago. What sample size should you use if you want to be within 4 percentage points with 95% accuracy?

Answer rating: 100% (QA)

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