Homework Answers

a departmental store, one cashier is there to serve the customers. And the customer

pick up their needs by themselves.

The arrival rate is 9 customers for every 5 minutes and

the cashier can serve 10 customers in 5 minutes, Assuming Poison arrival rate and

Exponential distribution for service rate,

find

i)

Avetage number of customers in the sestem

id.) Average time a customer spends in the system.

ili) Average number of customers in the queue or average queue length.

iv.) Average time a customer waits before being

served.

Identify the claim: A researcher reports that the average salary of a teacher is less than ₱20,000. A sample of 55 nurses has a mean salary of ₱19,500. At α = 0.05, test the claim that a nurse earn less than ₱20,000 a month. The standard deviation of the population is ₱2,900. *

Identify the claim: A researcher reports that the average salary of a teacher is less than ₱20,000. A sample of 55 nurses has a mean salary of ₱19,500. At α = 0.05, test the claim that a nurse earn less than ₱20,000 a month. The standard deviation of the population is ₱2,900.

1 A random sample of size 70 was used with a population standard deviation. of 15. Assuming that there is a 92% confidence level, what is the margin of error?

n =

σ=

Za/2 =

formula to be used:

solution:

2. Compute for the appropriate sample size needed if the margin of error is 15, with a population standard deviation of 43 and a 98% level of confidence.

E =

σ =

Za/2 =

formula to be used:

solution: