A Supermarket Has Just Added a New Cash Register to Reduce

question 87

Essay

A supermarket has just added a new cash register to reduce the waiting times of the customers during weekends.Since a new cash register is added,the customers expect that their waiting time will be less than the waiting time before the cash register was added.Suppose the sample variance of the waiting times for 25 customers before adding the new cash register is = 4.8 minutes,while the sample variance of the waiting times for 25 customers after adding the cash register is = 2.2 minutes.The manager of the supermarket believes that the waiting times are normally distributed and that the two samples are drawn independently.
A)Develop the hypotheses to test whether the ratio of two population variances is less than 1.
B)Calculate the appropriate test statistic.
C)Using the p-value approach,determine the decision rule at the 5% significance level.
D)What is the conclusion? Given that all other criteria are satisfied,should the supermarket continue with the new cash register?

• A)Develop the hypotheses to test whether the ratio of two population variances is less than 1.
• B)Calculate the appropriate test statistic.
• C)Using the p-value approach,determine the decision rule at the 5% significance level.
• D)What is the conclusion? Given that all other criteria are satisfied,should the supermarket continue with the new cash register?

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Definitions:

Electronic Health Record

A digital version of a patient's paper chart, making information available instantly and securely to authorized users.

Electronic Health Record

A digital version of a patient’s medical history, maintained over time by authorized health care providers and accessible across different health care settings.

Practice Management

A category of healthcare management for optimizing the daily operations of a medical practice.

Electronic Medical Record

Digital versions of patients' paper charts that contain a patient's medical history, diagnoses, medications, treatment plans, immunization dates, allergies, radiology images, and laboratory test results.