One brand of coffee maker claims that it brews a full pot of coffee in 4...

One brand of coffee maker claims that it brews a full pot of coffee in 4 minutes 240 seconds). A random sample of brewing a pot in 150 of these coffee makers yields a mean "brew time" of minutes and 56 seconds (236 seconds) with a standard deviation of 5 seconds.

(a) Is there significant evidence that the "brew time" is different from 4 minutes? Show all steps in your process .

(b)Find a 99% confidence interval for the mean brew time for this brand of coffee maker

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Expert Solution

orchestra answered 1 year ago

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