ࡱ> proE (jbjb ccc2l,`j@(hhhh, jK@Khhw@(hh""i :q,JJ,-۾Gd $``RTTLAB: TIDES AT THE BATTERY, NY NY State / DLESE Collection (www.dlese.org) Copyright 2005 by Charles A. Burrows PROBLEM: How can graphs be used to understand the tides? MATERIALS: A computer, Microsoft Excel, a printer, Internet access. PROCEDURE: 1. Go to:  HYPERLINK "http://tidesonline.nos.noaa.gov/data_read.shtml?station_info=8518750+The+Battery,+NY" http://tidesonline.nos.noaa.gov/data_read.shtml?station_info=8518750+the+battery,+ny 2. Highlight the entire page and copy it. (Holding down , hit then !!) 3. Open a new workbook in Microsoft Excel. 4. Click on the top left empty cell (A1) and paste the data into the sheet. (Hold down and hit !!!) 5. Click on "A" to select/highlight only the first column. 6. Choose , from the top menu. 7. Choose "Fixed width" and click "Finished." 8. Now, you must delete all of the columns except for the date, time, "pre." and "obs." (Select the unwanted columns by clicking the letter at the top of the column. Choose and from the top menu to delete them.) * pre. - predicted water level * obs. - observed water level 9. At the top of each column, right above the very first number in each column, type in a title for that column: Date, Time, Predicted Water Level, and Observed Water Level. 10. Click on the label, "Time," right above the top time, and holding down the button, move the mouse over two columns to the right, then down to the last number in the "Observed Water Level" column that is not repeating. All Times, Predicted Water Levels and Observed Water Levels need to be highlighted now (not including any cell with repeating numbers.) 11. Click on and from the top menu. Choose "Line," then the top left graph option. Click "Finish." 12. From the top menu, choose and . Check off "As new sheet" and click "OK." 13. From the top menu, choose and . Add a title and labels to your graph. 14. From the top menu, choose and . 15. Print your graph when you are satisfied with it!! Don't forget your name and the date!!!  QUESTIONS: How did the tides change over time? What kind of change is this? How many high tides occurred? Were all of the high tides the same height? Explain. When the highest high tide occurred, was the low tide higher or lower than usual? How much time passed from one high tide to the next high tide? Predict when the next high tide will occur. When did the greatest tidal range occur? What was the range? Based on your graph, were the predictions accurate? Explain.  Extra: How accurate were the predictions? Calculate the percent deviations of the predicted water levels. 1. In the cell to the right of the first "Observed Water Level" number, enter an equal sign = . Click on the first predicted water level number. Type a minus sign - , click on the first observed water level number. Hit "Enter" on the keyboard. You should now see the difference between the predicted and observed water levels. 2. Click on the calculated difference and drag straight down next to the last non-repeating number. From the "Edit" menu, choose "Fill" and "Down" to copy the formula into all of the selected cells. 3. In the cell to the right of the first calculated difference, type an equal sign = , click on the first calculated difference, type a back-slash / , click on the first observed water level, type an asterisk * , type 100 . Hit "Enter." 4. Click on the calculated percent deviation and drag straight down next to the last calculated difference. From the Edit menu, choose "Fill" and "Down" to copy the formula into all of the selected cells. 5. In the cell to the right of the first calculated percent deviation, find the average percent deviation. Hint: Use a formula such as this =average(f9:f487) (This formula averages all numbers from f9 down to f487.)  Go further: 21. Go to:  HYPERLINK "http://tidesonline.nos.noaa.gov/data_read.shtml?station_info=9410170+San+Diego,+CA" http://tidesonline.nos.noaa.gov/data_read.shtml?station_info=9410170+san+diego,+ca 22. Repeat the activity for tides at San Diego, California. 23. These tides make a different pattern!!! Why????? Research the different kinds of tidal patterns: Diurnal, Semidiurnal, and Mixed. 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