1. The water quality of the Sarawak River system was tested for heavy metal contamination. The average heavy metal concentration from a sample of 49 different locations is 3 grams per milliliter with a standard deviation of 0.5. Construct a 99% confidence interval for the mean heavy metal concentration.

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chapter: ESTIMATION

1. The water quality of the Sarawak River system was tested for heavy metal
contamination. The average heavy metal concentration from a sample of 49 different
locations is 3 grams per milliliter with a standard deviation of 0.5. Construct a 99%
confidence interval for the mean heavy metal concentration.
2. The contents of seven cans of diet coke are 350, 345, 355, 340, 360, 350, and 365
milliliters. Assuming the contents are normally distributed, calculate a 95% confidence
interval for the mean content.
Transcribed Image Text:1. The water quality of the Sarawak River system was tested for heavy metal contamination. The average heavy metal concentration from a sample of 49 different locations is 3 grams per milliliter with a standard deviation of 0.5. Construct a 99% confidence interval for the mean heavy metal concentration. 2. The contents of seven cans of diet coke are 350, 345, 355, 340, 360, 350, and 365 milliliters. Assuming the contents are normally distributed, calculate a 95% confidence interval for the mean content.
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