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? LOADING... 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. 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 nothing, which is less than 0.05. B. 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 nothing, which is more than 0.05. C. 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 nothing, which is less than 0.05. D. 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 nothing, which is more than 0.05.
4.2
5.1
2.9
9.6
3.3
3.6
0.3
7.6
4.1
3.2
4.3
2.8
3.1
9.7
6.1
5.4
4.4
0.3
2.3
5.2
4.4
3.3
2.4
2.7
4.3
Here
sample proportion of customers will have to wait less than five
minutes for service
To test
against
The test statistic can be written as
which under H0 follows a standard normal
distribution.
We reject H0 at 0.05 level of significance if P-value< 0.05
Now,
The value of the test statistic
Now,
The probability of observing a sample proportion as low as the one in this sample given a population proportion of 0.75 is
D. 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 0.364517 which is more than 0.05.
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