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interpretation of confidence

interpretation of confidence - Confidence Intervals Example...

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Confidence Intervals Example 1 ● An urban economist wishes to estimate the mean amount of time people spend traveling to work. He obtains a random sample of 50 individuals who are in the labor force and finds that the mean travel time is 24.2 minutes. Assuming the population standard deviation of travel time is 18.5 minutes, construct and interpret a 95% confidence interval for the mean travel time to work. Interpretation: We estimate the mean travel time to work to be between 19.1 and 29.3 minutes. (95% CI) Fall 2008 1

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Confidence Interval Example 2 The following data represent the battery life in hours, for a random sample of 10 full charges on a fifth- generation iPod music player. 7.3 6.6 10.2 10.2 12.9 9.0 10.8 8.5 12.1 7.1 Construct a 98% confidence interval for the mean number hours the battery will last on this player. Assume σ = 1.5 . Interpretation: It is estimated that the mean number of hours the battery will last on a fifth-generation iPod music player is between 8.37 and 10.57 hours. (98%CI) Fall 2008 2
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interpretation of confidence - Confidence Intervals Example...

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