round two four decimals if needed Managers at a local phone service wireless ret

Question

round two four decimals if needed

Managers at a local phone service wireless retail center have a goal that 75% of the center's customers will have to wait less than five minutes for service. The data below shows the wait times of a random sample of 25 customers in minutes. Does this sample provide evidence that management's goal is being achieved? Click the icon to view the random sample of wait times. Does this sample provide evidence that management's goal is being achieved? (Round to four decimal places as needed.) A. Yes, because the probability of observing a sample proportion as low as the one in this sample given a population proportion 0.75 is, which is more than 0.05. B. yes, because the probability of observing a sample proportion as low as the one in this sample given a population proportion of 0.75 is, which is less than 0.05. C. No, because the probability of observing a sample proportion as low as the one in this sample given a population proportion of 0.75 is, which is more than of 0.05. D. No, because the probability of observing a sample proportion as low as the one in this sample given a population proportion of 0.75 is, which is less than 0.05.

Explanation / Answer

ans=

Since in the given sample of total 25 members,

i will had to wait more than 5 minutes.

the probability that 7 members has to wait for less than 5 minutes

= (25-7)/25

= 18/25 =0.72

which is more than 0.05

ans=

C)no,because the probabulity of observing a sample proprtion as low as the one in this sample given a population of 0.75 which is more than 0.05

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