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 **
I see numbers 1 through 10. Beside each number, it has 2 columns of numbers.
** Your TIMER data from 20 fast clicks **
1 7.203125 7.203125
2 7.359375 .15625
3 7.515625 .15625
4 7.671875 .15625
5 7.8125 .140625
6 7.953125 .140625
7 8.09375 .140625
8 8.25 .15625
9 8.390625 .140625
10 8.53125 .140625
11 8.6875 .15625
12 8.828125 .140625
13 8.96875 .140625
14 9.109375 .140625
15 9.265625 .15625
16 9.40625 .140625
17 9.546875 .140625
18 9.71875 .171875
19 9.96875 .25
20 10.15625 .1875
** Your average time interval for 20 time intervals **
2.71628
I counted the number of times each interval occurred, multiplied the interval by the number of occurences, added all the intervals up and divided by 19.
** Your frequency distribution for the 20 time intervals (interval, number of times it was observed) **
.140625, 10
.15625, 6
.171875, 1
.1875, 1
.25, 1
your mean time interval is not at all consistent with this tally; mean can't be larger than any of the numbers tallied. See the link at the end; nothing you won't find easy to understand.
** Your general comment to this point **
** Why did you observe only certain time intervals? **
I believe the timer program rounds the intervals to the closest match in the system. I don't think the program is flawed, it's just how it was programmed. I believe the program would be useful in applications where it is not pertinent to be exact.
** What did you see when you looked at the differences between time successive time intervals? **
It shows that whether the intervals are increasing or decreasing in time.
** Your time intervals for 7 complete breaths: **
2.65625
2.578125
2.734375
2.578125
2.8125
2.890625
2.890625
3.09375
2.828125
** Your general comment to this point: **
** Why did you rarely, if ever, observe that same time interval twice? **
The longer the amount of time between the events, there is less chances for it to hit exactly each time.
** Do you think this program is accurate to .1 or .01 ... **
d. The TIMER program is capable of determining the time between two events accurately to within about .0001 second.
I believe that the timer program reports this way because of the amount of numbers after the decimal.
** 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
1 846.9531 846.9531
2 849.6094 2.65625
3 852.1875 2.578125
4 854.9219 2.734375
5 857.5 2.578125
** **
30 minutes
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