A Grocery Store Is Interested in Determining Whether or Not $$\mu _ { T C } - \mu _ { S T } , \text { was }$$

Multiple Choice

A grocery store is interested in determining whether or not a difference exists between the shelf life of Tasty Choice doughnuts and Sugar Twist doughnuts.A random sample of 100 boxes of each brand was selected and the mean shelf life in days was determined for each brand .A 90% confidence interval for the difference of the means, $$\mu _ { T C } - \mu _ { S T } , \text { was }$$
determined to be (1.3, 2.5) .

A) We know that 90% of Tasty Choice doughnuts last between 1.3 and 2.5 days longer than Sugar Twist doughnuts.
B) Based on this sample, we are 90% confident that Sugar Twist doughnuts will last on average between 1.3 and 2.5 days longer than Tasty Choice doughnuts.
C) We are 90% confident that a randomly selected box of Tasty Choice doughnuts will have a shelf life that is between 1.3 and 2.5 days longer than a randomly selected box of Sugar
Twist doughnuts.
D) We know that 90% of all random samples done on the population will show that the mean shelf life of Tasty Choice doughnuts is between 1.3 and 2.5 days longer than the
Mean shelf life of Sugar Twist doughnuts.
E) Based on this sample, we are 90% confident that Tasty Choice doughnuts will last on average between 1.3 and 2.5 days longer than Sugar Twist doughnuts.