132,000 189,000 270,000 324,800 269,000 340,000 222,000 135,000 169,900 310,000 142,900 86,000 285,000 235,000 425,000 Some students think that a 90% confidence interval contains 90% of the data. Use the list of data above to count how many of the data values lie within the confidence interval. What percent is this? Is the percent close to 90%? Explain why this percent should or should not be close to 90%. What happens to the EBM as the confidence level increases? Does the width of the confidence interval increase or decrease? Explain why this happens.

Some students think that a 90% confidence interval contains 90% of the data. Use the list of data above to count how many of the data values lie within the confidence interval. What percent is this? Is the percent close to 90%? Explain why this percent should or should not be close to 90%.

What happens to the EBM as the confidence level increases? Does the width of the confidence interval increase or decrease? Explain why this happens.