Example 7 analyzed the trading volume of shares of General Electric stock between February and April 2011. Summary statistics of the data were calculated using MINITAB and are shown below:

The 95% confidence intervals for the means are (40.2685, 63.3679) for Monday€™s volume and (42.7963, 57.2037) for Friday€™s. Interpret each of these intervals, and explain what you learn by comparing them.

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Variable Mean SE Mean StDev Median Monday Friday 12 50.00 3.27 11.34 47.00 11 51.82 .18 17.19 45.00