admium, a heavy metal, is toxic to animals. Mushrooms are able to absorb and accumulate cadmium at high concentrations. The Czech and Slovak governments have set a safety limit for cadmium in dry vegetables at 0.5 parts per million. M. Melgar et al. measured the cadmium levels in a random sample of the edible mushroom Boletuspenicolaand published the result in the Journal of Environmental Science and Health (Vol, B33(4) pp 439 - 455). Find a 99%confidence interval for the mean cadmium levels. The following data was collected: 0.24 0.59 0.62 0.16 0.77 1.33 0.92 0.19 0.33 0.25 0.59 0.32