Confidence intervals

Introduction to Confidence Intervals

1 Activity

Like airplane food?  Bacteria love to linger on the plastic trays in front of your seat.  Tested tray tables were found to have an average of 2,155 colony-forming units (CFUs) per square inch.  Which of the following is true when a 95% confidence interval is conducted for the average CFU’s on plane tray tables?

The true population mean is 2,155 CFU.

A 95% confidence interval tells us that 95% of the population fall within that interval.

A 95% confidence interval tells us that there is a 95% probability that the true population mean is within that interval.

A 95% confidence interval tells us that we are 95% confident that the true population mean is within that interval.

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Confidence Intervals

Which of the following is true about confidence intervals? 

Confidence intervals

Which of the following is true about confidence intervals? 

Confidence intervals

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