PHY 121
Your 'timer program' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** Your General Comment **
** Describe what you see on your first 10 clicks **
There is a list of 3 columns all of which contain 10 numbers. The first column is the number of times that I hit the timer button. The second column is the TOTAL time that has passed. The third column is the intervals in between hitting the timer button.
** Your TIMER data from 20 fast clicks **
1 166.0781 166.0781
2 166.2344 .15625
3 166.3594 .125
4 166.5156 .15625
5 166.6563 .140625
6 166.8125 .15625
7 166.9688 .15625
8 167.1094 .140625
9 167.2656 .15625
10 167.4375 .171875
11 167.5938 .15625
12 167.75 .15625
13 167.9063 .15625
14 168.0781 .171875
15 168.2188 .140625
16 168.4063 .1875
17 168.5781 .171875
18 168.7344 .15625
19 168.9063 .171875
20 169.0469 .140625
** Your average time interval for 20 time intervals **
.1484375
I added all of the numbers and divided by 20.
** Your frequency distribution for the 20 time intervals (interval, number of times it was observed) **
.15625, 9
.125, 1
.140625,4
.171875,4
.1875,1
** Your general comment to this point **
The number on the timer for the first interval was 166.0781, should I have included this on the numbers that reoccur?
** Why did you observe only certain time intervals? **
No the timer is not flawed. As you get to the one hundredths and millionths of a second the numbers are moving so fast that the computer ends up rounding the numbers. It is not useless because it gives a generally accurate estimate of the time passed. If you are testing something that needs a great amount of accuracy then this counter might become useless.
** What did you see when you looked at the differences between time successive time intervals? **
Considering the intervals are generally the same, the time between each interval will stay similar to one another.
** Your time intervals for 7 complete breaths: **
2.984375
3.796875
4.890625
4.046875
4.328125
4.03125
4.09375
4.15625
3.703125
** Your general comment to this point: **
** Why did you rarely, if ever, observe that same time interval twice? **
Because when you do the fast clicks, your body gets into a rhythm. This was, the intervals can reappear. When you are breathing, your body doesn't pick up a rhythm.
** Do you think this program is accurate to .1 or .01 ... **
b. The TIMER program is capable of determining the time between two events accurately to within about .01 second.
The timer isn't completely accurate. So it would be safe to say that it can measure within .01 seconds.
** Copy of a few lines of your spreadsheet from the TIMER program. **
series of regular breaths time at beginning of inhalation
event number clock time time interval
1 4.015625 4.015625
2 7.046875 3.03125
** **
30 min.
** **
&#This looks very good. Let me know if you have any questions. &#