Until its recent indictment as a possible carcinogen, cyclamate was a widely used sweetener in soft drinks. The following data show a comparison of three laboratory methods for determining the percentage of sodium cyclamate in commercially produced orange drink. All three procedures were applied to each of twelve samples (156).

Use Friedman€™s test to determine whether the differences from method to method are statistically significant. Let α = 0.05.

Method Sample Picryl Chloride Davies AOAC 0.598 0.614 0.600 0.580 0.596 0.592 0.616 0.614 0.604 0.608 0.602 0.614 0.628 0.632 0.628 0.630 0.600 0.622 0.612 0.584 0.600 0.650 0.628 0.606 0.628 0.644 0.644 0.644 0.644 0.624 0.612 0.619 0.628 0.632 0.644 0.616 10 12