Question: Question (4) A grocery store is interested in determining whether or not a difference exists between the shelf life of two different brands of doughnuts.

Question (4)

A grocery store is interested in determining whether or not a difference exists between the shelf life of two different brands of doughnuts. A random sample of 100 boxes of each brand was selected and the shelf life in days was determined for each box. The sample results are given below.

Brand A B

Sample mean 2.1 2.9

Sample standard deviation 0.8 1.1

Using a 90% confidence, do you think there is a difference in shelf life of the two brands?

Question (5)

A political scientist believes that a given candidate is supported by more than 60% of the votes in the city. He randomly selected a sample of 200 eligible voters in the city and found that only 130 of them declared that they support the candidate. At = 0.10, is his belief correct?

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