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Last year a fast food restaurant had a mean service time of 155 seconds. This year...

Last year a fast food restaurant had a mean service time of 155 seconds. This year the manager wants to determine whether the population mean service time has been reducedA sample of 45 customers is selected and the sample mean service time = 151 seconds . Suppose the population standard deviation sigma = 25 seconds.
(a) What is the population? What is the sample?
(b) Ata = 0.1 level of significance, determine whether there is evidence that the population mean service time is less than last year's 155 seconds .
(c) Identify the type of error for your conclusion Find the probability of error and probability of confidence if it is type error
Math   Statistics-And-Probability   
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