The amount of time in minutes that it took to complete a grocery store checkout for...
Homework Answers
mean = (2 + 11 + 1 + 6 + 5) / 5 = 5
Sample variance = [(2 - 5)2 + (11 - 5)2 + (1 - 5)2 + (6 - 5)2 + (5 - 5)2] / 4 = 15.5 (ans)
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The amount of time in minutes that it took to complete a
grocery store checkout for...
4. A grocery story recorded amount of time that 20 randomly selected shoppers waited in checkout...
4. A grocery story recorded amount of time that 20 randomly selected shoppers waited in checkout lines. The mean was 203 seconds (3 minutes, 23 seconds) and the standard deviation was 54 seconds. Construct a 95% confidence interval for the mean wait time for all of the shoppers at the grocery store. (You must show work and/or TI calculator commands to receive credit. You may give your answer in seconds) (1 point)
A grocery store has both a regular checkout line and an express checkout line. Let 푋1be...
A grocery store has both a regular checkout line and an express checkout line. Let 푋1be the number of customers in the regular checkout line at a particulartime of day, and let 푋2be the number of customers in the express checkout lineat the same time. The joint PMF of 푋1and 푋2is given in the table below. 푋20123푋10.08.07.04.001.06.15.05.042.05.04.10.063.00.03.04.074.00.01.05.06(1) How do you know this is a valid PMF?(2) What is the probability that there areexactly two customers in each line?(3) What is...
The manager of a grocery store has taken a random sample of 100 customers. The average...
The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took these 100 customers to check out was 6.0 minutes. It is known that the standard deviation of the checkout time is 2.0 minutes. Refer to Exhibit 8-2. If the confidence coefficient is reduced to 0.90, the margin of error becomes negative will increase will decrease remains unchanged
A certain small grocery store has a single checkout stand with a full-time cashier manning it....
A certain small grocery store has a single checkout stand with a full-time cashier manning it. Customers arrive at the stand randomly (i.e. Poisson input process) at a mean rate of 30 per hour. When there is only one customer at the stand, he is processed by the cashier alone, with an expected service time of 1.5 minutes. However, the stock boy has been given standard instructions that whenever there is more than one customer at the stand, he is...
Suppose the waiting time, in minutes, at a checkout line in a local super market follows...
Suppose the waiting time, in minutes, at a checkout line in a local super market follows a Uniform distribution in the interval (1,6) a. How long is a randomly chosen customer at the super market expected to wait at the checkout counter? b. What is the probability that a randomly chosen customer at the super market will wait between 2 and 5 minutes to be checked out? c. Suppose a random sample of 100 customers is taken at the super...
Customer arrives at a grocery store to checkout counter according to a Poisson process with rate...
Customer arrives at a grocery store to checkout counter according to a Poisson process with rate per minute. Each customer carries a number of items that is uniformly distributed between 1 and 40. The store has 2 checkout counters, each capable of processing items at a rate of 15 per minute. To reduce the customer wait in queue, the store manager considers dedicating a one of the two counters to customers with x items or less and dedicating one of...
Comparing Two Population Means - Example: Checkout Time The U-Scan facility was recently installed at the Byme Road Food- Town location. The store manager would like to know if the mearn checkout...
Comparing Two Population Means - Example: Checkout Time The U-Scan facility was recently installed at the Byme Road Food- Town location. The store manager would like to know if the mearn checkout time using the standard checkout method is longer than using the U-Scan. She gathered the following sample information. The time is measured from when the customer enters the line until their bags are in the cart. Hence the time includes both waiting in line and checking out. Population...
The mean checkout time for all customers at Corner Convenience Store is to be estimated using...
The mean checkout time for all customers at Corner Convenience Store is to be estimated using mean checkout time for 75 randomly selected customers. Match column II with the statistical term in column I Column II Column I a) The 75 customers b) The mean time for all customers c) 2 minutes, one customer's checkout Data value Data set Experiment Parameter Population Sample Statistic Variable time d) the mean time for the 75 customers e) all customers at Corner Convenience...
QUESTION 27 The manager of a grocery store has taken a random sample of 100 customers....
QUESTION 27 The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took the customers in the sample to check out was 55 minutes and the sample standard deviation was 2 minutes. We want to test to determine whether or not the mean waiting time of all customers is significantly more than 5 minutes The hypothesis to test the manager's concern is: Hops 5, Ha>5 The test statistic is a...
Service time for a customer coming through a checkout counter in a retail store is a...
Service time for a customer coming through a checkout counter in a retail store is a random variable with the mean of 4.0 minutes and standard deviation of 1.5 minutes. Suppose that the distribution of service time is fairly close to a normal distribution. Suppose there are two counters in a store, n1=41 customers in the first line and n2=51 customers in the second line. a.Compute the mean and the variance of X1 bar−?2 bar. b.Find the probability that the...
4. A grocery story recorded amount of time that 20 randomly selected shoppers waited in checkout lines. The mean was 203 seconds (3 minutes, 23 seconds) and the standard deviation was 54 seconds. Construct a 95% confidence interval for the mean wait time for all of the shoppers at the grocery store. (You must show work and/or TI calculator commands to receive credit. You may give your answer in seconds) (1 point)
The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took these 100 customers to check out was 6.0 minutes. It is known that the standard deviation of the checkout time is 2.0 minutes. Refer to Exhibit 8-2. If the confidence coefficient is reduced to 0.90, the margin of error becomes negative will increase will decrease remains unchanged
Comparing Two Population Means - Example: Checkout Time The U-Scan facility was recently installed at the Byme Road Food- Town location. The store manager would like to know if the mearn checkout time using the standard checkout method is longer than using the U-Scan. She gathered the following sample information. The time is measured from when the customer enters the line until their bags are in the cart. Hence the time includes both waiting in line and checking out. Population...
The mean checkout time for all customers at Corner Convenience Store is to be estimated using mean checkout time for 75 randomly selected customers. Match column II with the statistical term in column I Column II Column I a) The 75 customers b) The mean time for all customers c) 2 minutes, one customer's checkout Data value Data set Experiment Parameter Population Sample Statistic Variable time d) the mean time for the 75 customers e) all customers at Corner Convenience...
QUESTION 27 The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took the customers in the sample to check out was 55 minutes and the sample standard deviation was 2 minutes. We want to test to determine whether or not the mean waiting time of all customers is significantly more than 5 minutes The hypothesis to test the manager's concern is: Hops 5, Ha>5 The test statistic is a...
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