You asked for a 10-week moving average. If you simply pull up a chart for your fav stock and enter 10 in the Technicals/Moving Average field, chances are you will get the 10-DAY moving average, not the 10-week moving average.

When a chart displays a moving average, it displays the "10-period" moving average, and you have to set the chart period to days or weeks. So just be careful.