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A study revealed that the amount of lead (micrograms/gram) in medicine manufactured at a certain overseas company and sold in the U.S. via internet. The
A study revealed that the amount of lead (micrograms/gram) in medicine manufactured at a certain overseas company and sold in the U.S. via internet. The mean of a sample of 9 randomly selected orders was 10.5 micrograms/gram with a standard deviation of 3.2 micrograms/gram. The variable was normally distributed. You will construct a 98% confidence interval for the population mean. What will be your z or t value?
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