Question
To decide whether or not to purchase a new hand-held laser scanner for use in inventorying stock, tests are conducted on the scanner currently in
To decide whether or not to purchase a new hand-held laser scanner for use in inventorying stock, tests are conducted on the scanner currently in use and on the new scanner. These data are obtained on the number of 7-inch bar codes that can be scanned per second:
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new old
n1 = 61 n2 = 61
x1(bar) = 40 x2(bar) = 29
2 2
s = 24.9 s = 22.7
1 2
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2 2
#1. Test H0: sigma = sigma at the alpha = 0.2 level to be sure that pooling is appropriate.
1 2
#2. Does the new laser appear to read more bar codes per second on the average ? Explain.
#3. Since the number of bar codes that can be scanned per second is discrete, we have not satisfied the normality requirement. What theorem justifies the use of the pooled T procedure in this case ?
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