Researchers investigated the market share of a product called Funny in a variety of retail stores. A few stores ran advertisements during certain weeks. Researchers assemble the following data:

The standard deviation of all observations for the variable Market Share Funny is 0.095. Is there an association between advertising (1 = advertising; 0 = no advertising) and (metric) market share achieved? Identify the appropriate measure of association.

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Market share for Funny Store promotion No Yes Mean Std. deviation Mean Std. deviation Statistic 0.3688 0.0943 0.4090 0.0963