A random sample of 104 lightning flashes in a certain region resulted in a sampl

Question

A random sample of 104 lightning flashes in a certain region resulted in a sample average radar echo duration of 0.90 sec and a sample standard deviation of 0.39 sec. Calculate a 99% (two-sided) confidence interval for the true average echo duration mu. (Round your answers to two decimal places.) Interpret the resulting interval We are 99% confident that this interval contains the true population mean. We are 99% confident that this interval does not contain the true population mean. We are 99% confident that the true population mean lies above this interval. We are 99% confident that the true population mean lies below this interval.

Explanation / Answer

The statistical software output for this problem is:

One sample T confidence interval:
: Mean of population

99% confidence interval results:

Hence,

99% confidence interval will be:

(0.80, 1.00)

Mean Sample Mean Std. Err. DF L. Limit U. Limit 0.9 0.038242646 103 0.79963574 1.0003643

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