** Confidence
Interval for Wind Speed in the Republic of Ireland
**In
this activity, you will be calculating the 95% confidence
interval for
the daily wind speed in the Republic of Ireland from 1961-1978.
The data is a random sample from a data set containing over 74,000 points.

Using the data set in Excel, determine the mean and standard deviation for the daily wind speed. Then calculate the 95% confidence interval.

1. What is the mean?

2.
What
is the standard deviation?

3.
What is the 95% confidence interval?

4.
Would the confidence
interval become wider or more narrow, if the confidence level was 90%?

5. What is the primary reason that the interval is the width that it is?

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