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I just want to make sure I'm in the right track for this question 6. 30packages are randomly selected from packages received by a parcel

I just want to make sure I'm in the right track for this question

6. 30packages are randomly selected from packages received by a parcel service. The sample has a mean weight of 12.3 pounds and a standard deviation of 1.5 pounds. What is the 95 percent confidence interval for the true mean weight /, of all packages received by the parcel service? E = t . X-E

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