A protein powder manufacturer randomly selected 35 samples of their top selling product. The sample's standard deviation is 4.2 grams. Assuming the weights of the protein powder product is normally distributed, construct a (a) 88%; (b) 98% confidence interval for the population variance and standard deviation.

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Q: The mean tar content of a simple random sample of 25 unfiltered​ king-size cigarettes is 21.4 ​mg,…

A: Hello! As you have posted more than 3 sub parts, we are answering the first 3 sub-parts.  In case…