A water company from A Corunia wants to control the performance of the counters installed throughout the city. 60 subsamples are taken each one composed by 3 measurements made by the counters of the same antiquity (10 years) and caliber, in a period of 5 years. Taking into account that there are two brands or providers of counters
A data frame with 180 observations on the following 3 variables:
the measurement error of the counters (Error: (Real Volume - Measured Volume)/Real Volume)
brands of providers of counters
1 2 3 4 5
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