A food inspector examines 16 jars of a certain brand of jam to determine the percent of foreign impurities. The following data were recorded. Using the normal approximation to the binomial distribution, perform a sign test at the 0.05 level of significance to test the null hypothesis that the median percent of impurities in this brand of jam is 2.5% against the alternative that the median percent of impurities is not2.5%.

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2.3 2.2 3.1 1.7 1.1 4.2 2.3 1.2 1.0 2.4 2.4 2.3 1.6 1.1 19 1.7 3.6