Confidence Interval for Ireland Wind Speed Data

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 Excel, determine the mean and the standard deviation for the daily wind speed. Then, using these two values, calculate the confidence interval. If you are using a TI-83 calculator, here are the three relevant guides: mean, standard deviation, confidence interval.

The data exists in three files; one is in Excel Data format, one is in Text format, and one is in TI-83 Group format. If you want to determine the confidence interval using the TI-83, you will have to import the data into the calculator from the computer after you have downloaded the file.

What is the mean? What is the standard deviation? What is the 95% confidence interval? What does the 95% confidence interval indicate about the data? Would the confidence interval become larger or smaller, if the confidence level was raised to 99%? lowered to 90%?