In the figure below, which attribute is multivalued? 
Definitions:
Margin of Error
A measure of the range of values below and above the sample statistic in a confidence interval within which the true population parameter is expected to lie.
Sample Mean
The mean of a set of samples, obtained by adding all the values together and then dividing by the total count of observations.
Weekdays
The days of the week typically considered as working days, usually Monday through Friday, excluding the weekend.
Sampling Distribution
A statistical function that describes all the possible values and likelihoods that a statistic can take within a given range.
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