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

Question

A random sample of 104 lightning flashes in a certain region resulted in a samp Calculate a 99% (two-sided) confidence interval for the true le average radar echo duration of 0.78 sec and a sample standard deviation of 0.40 sec. average echo duration (Round your answers to two decimal places.) sec Interpret the resulting interval. 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. O we are 99% confident that the true population mean lies below this interval. o we are 99% confident that this interval contains the true population mean. You may need to use the appropriate table in the Appendix of Tables to answer this question.

Explanation / Answer

The statistical software output for this problem is:

One sample T summary confidence interval:
: Mean of population

99% confidence interval results:

Hence,

99% confidence interval will be:

(0.68, 0.88) sec

Interpretation: Option D is correct.

Mean Sample Mean Std. Err. DF L. Limit U. Limit 0.78 0.039223227 103 0.6770623 0.8829377

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