Use the following selected information from Wheeler,LLC to determine the 2015 and 2014 common size percentages for cost of goods sold using Net sales as the base. 
Definitions:
Proportion of Successes
It's the ratio of the number of successful outcomes to the total number of attempts or trials in a given experiment or set of data.
Clinic Waiting Time
Clinic waiting time refers to the duration a patient has to wait from their scheduled appointment time until they are seen by a healthcare provider.
Population Variances
Measures of the dispersion of a population's data points, reflecting how data points spread out from the mean.
Confidence
In statistics, confidence refers to the probability that a parameter lies within a specified interval estimate.
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