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Lab
: 20 Measurements
Lab Assignment:
1.
Obtain a small ruler of about 6 inches in length.
Choose two well defined points on a wall,
table, floor, or any surface about 4 to 6 feet apart from each other.
2.
With the ruler, measure this straight line distance with the ruler.
When taking the distance
reading, read the ruler to the first interpolated digit.
For example if the ruler is in eights of an inch,
interpolate to sixteenths.
3.
Repeat the measuring process 20 times.
This is your sample of 20 repeated measurements of a
distance.
4.
Calculate the sample mean, and standard deviation.
Identify any blunders (outliers) lying
outside a 3 sigma rejection limit.
After taking these out of your sample, recompute the sample
mean and standard deviation.
Any blunders?
5.
Analyze your sample data to determine whether you have a normal distribution.
a.
Plot a histogram, using five equalwidth intervals.
Interpret this diagram to see if the
data's normally distributed.
1.
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 Spring '11
 Gibson

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